feat: generate netapp charm

[ahmad-can]

Related Charm https://review.opendev.org/c/openstack/sunbeam-charms/+/984497

[Copilot]

Pull request overview

This PR adds a new NetApp ONTAP Cinder storage backend to Sunbeam and wires it into the unit test suite so the backend is discoverable and validated alongside existing backends.

Changes:

• Add NetAppBackend and NetAppConfig (including secret-marked config fields) under sunbeam.storage.backends.netapp.
• Add NetApp-specific unit tests and include the backend in shared backend tests/fixtures.
• Extend common backend uniqueness/expectation tests to include netapp.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
sunbeam-python/tests/unit/sunbeam/storage/backends/test_netapp.py	New unit tests covering NetApp backend basics and config validation/secret markers.
sunbeam-python/tests/unit/sunbeam/storage/backends/test_common.py	Adds NetApp to shared “unique type/charm name” and expected-values tests.
sunbeam-python/tests/unit/sunbeam/storage/backends/conftest.py	Adds a netapp_backend fixture and includes NetApp in the parametrized any_backend fixture.
sunbeam-python/sunbeam/storage/backends/netapp/backend.py	Implements NetAppBackend and a large NetAppConfig model for charm configuration.
sunbeam-python/sunbeam/storage/backends/netapp/__init__.py	New package initializer for the NetApp backend module.

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