doc: mcumgr: update smp/smpclient; add smpmgr

smp & smpclient have complete, well-tested, coverage
of the spec. smpmgr application is added.

Signed-off-by: JP Hutchins <jp@intercreate.io>

Author: JPHutchins

doc/services/device_mgmt/mcumgr.rst

@@ -66,9 +66,11 @@ project.
         | and `iOS                                                                       |         |       |     |        |          |        |           |     |    |     |      |          |    |       |      |        |               | Swift      |            |
         | <https://github.com/NordicSemiconductor/IOS-nRF-Connect-Device-Manager>`_      |         |       |     |        |          |        |           |     |    |     |      |          |    |       |      |        |               |            |            |
         +--------------------------------------------------------------------------------+---------+-------+-----+--------+----------+--------+-----------+-----+----+-----+------+----------+----+-------+------+--------+---------------+------------+------------+
-        | `smp <https://pypi.org/project/smp/>`_                                         | ✓       | ✓     | ✓   | ✓      | ✕        | N/A    | N/A       | N/A | ✓  | ✓   | ✓    | ✓        | ✓  | ✓     | ✕    | ✓      | Library       | Python     | Apache-2.0 |
+        | `smp <https://pypi.org/project/smp/>`_                                         | ✓       | ✓     | ✓   | ✓      | ✕        | N/A    | N/A       | N/A | ✓  | ✓   | ✓    | ✓        | ✓  | ✓     | ✓    | ✓      | Library       | Python     | Apache-2.0 |
         +--------------------------------------------------------------------------------+---------+-------+-----+--------+----------+--------+-----------+-----+----+-----+------+----------+----+-------+------+--------+---------------+------------+------------+
-        | `smpclient <https://pypi.org/project/smpclient/>`_                             | ✓       | ✓     | ✓   | ✕      | ✕        | ✓      | ✓         | ✓   | ✓  | ✓   | ✓    | ✓        | ✓  | ✓     | ✕    | ✓      | Library       | Python     | Apache-2.0 |
+        | `smpclient <https://pypi.org/project/smpclient/>`_                             | ✓       | ✓     | ✓   | ✕      | ✕        | ✓      | ✓         | ✓   | ✓  | ✓   | ✓    | ✓        | ✓  | ✓     | ✓    | ✓      | Library       | Python     | Apache-2.0 |
+        +--------------------------------------------------------------------------------+---------+-------+-----+--------+----------+--------+-----------+-----+----+-----+------+----------+----+-------+------+--------+---------------+------------+------------+
+        | `smpmgr <https://pypi.org/project/smpmgr/>`_                                   | ✓       | ✓     | ✓   | ✕      | ✕        | ✓      | ✓         | ✓   | ✓  | ✓   | ✓    | ✕        | ✓  | ✓     | ✓    | ✕      | Application   | Python     | Apache-2.0 |
         +--------------------------------------------------------------------------------+---------+-------+-----+--------+----------+--------+-----------+-----+----+-----+------+----------+----+-------+------+--------+---------------+------------+------------+
         | Zephyr MCUmgr client (in-tree)                                                 | ✕       | ✓     | ✕   | ✕      | ✓        | ✓      | ✓         | ✓   | ✓  | ✓   | ✕    | ✕        | ✕  | ✕     | ✕    | ✕      | Library       | C          | Apache-2.0 |
         +--------------------------------------------------------------------------------+---------+-------+-----+--------+----------+--------+-----------+-----+----+-----+------+----------+----+-------+------+--------+---------------+------------+------------+
@@ -105,13 +107,17 @@ project.
         | and `iOS                                                                       |               |                 |    |     |      |          |    |       |      |        |               |            |
         | <https://github.com/NordicSemiconductor/IOS-nRF-Connect-Device-Manager>`_      |               |                 |    |     |      |          |    |       |      |        |               |            |
         +--------------------------------------------------------------------------------+---------------+-----------------+----+-----+------+----------+----+-------+------+--------+---------------+------------+
-        | `smp <https://pypi.org/project/smp/>`_                                         | Windows, |br| | N/A             | ✓  | ✓   | ✓    | ✓        | ✓  | ✓     | ✕    | ✓      | Library       | Python     |
+        | `smp <https://pypi.org/project/smp/>`_                                         | Windows, |br| | N/A             | ✓  | ✓   | ✓    | ✓        | ✓  | ✓     | ✓    | ✓      | Library       | Python     |
         |                                                                                | Linux, |br|   |                 |    |     |      |          |    |       |      |        |               |            |
         |                                                                                | macOS, |br|   |                 |    |     |      |          |    |       |      |        |               |            |
         |                                                                                | iOS, |br|     |                 |    |     |      |          |    |       |      |        |               |            |
         |                                                                                | Android       |                 |    |     |      |          |    |       |      |        |               |            |
         +--------------------------------------------------------------------------------+---------------+-----------------+----+-----+------+----------+----+-------+------+--------+---------------+------------+
-        | `smpclient <https://pypi.org/project/smpclient/>`_                             | Windows, |br| | Serial, |br|    | ✓  | ✓   | ✓    | ✓        | ✓  | ✓     | ✕    | ✓      | Library       | Python     |
+        | `smpclient <https://pypi.org/project/smpclient/>`_                             | Windows, |br| | Serial, |br|    | ✓  | ✓   | ✓    | ✓        | ✓  | ✓     | ✓    | ✓      | Library       | Python     |
+        |                                                                                | Linux, |br|   | Bluetooth, |br| |    |     |      |          |    |       |      |        |               |            |
+        |                                                                                | macOS         | UDP             |    |     |      |          |    |       |      |        |               |            |
+        +--------------------------------------------------------------------------------+---------------+-----------------+----+-----+------+----------+----+-------+------+--------+---------------+------------+
+        | `smpmgr <https://pypi.org/project/smpmgr/>`_                                   | Windows, |br| | Serial, |br|    | ✓  | ✓   | ✓    | ✕        | ✓  | ✓     | ✓    | ✕      | App           | Python     |
         |                                                                                | Linux, |br|   | Bluetooth, |br| |    |     |      |          |    |       |      |        |               |            |
         |                                                                                | macOS         | UDP             |    |     |      |          |    |       |      |        |               |            |
         +--------------------------------------------------------------------------------+---------------+-----------------+----+-----+------+----------+----+-------+------+--------+---------------+------------+