Standardize SDB packaging

[sdimitro]

= Changes

setup.py: add standard fields and fix any references to sdimitro repo
setup.py: add dependencies in setup.py and point requirements.txt to it
github actions: add testing for creating distribution archives

= Motivation

With this patch applied we are getting one step closer to publish SDB on PyPI
at which point anyone would be able to install it using pip. The remaining
work would be to register an account on PyPI and have a job that pushed
nightlies and official version of SDB on the registry.

= Tests

• python3 -m pip install -r requirements.txt installs drgn as expected
• python3 setup.py sdist bdist_wheel creates a dist directory with no errors

Published this as a package in TestPyPI -> https://test.pypi.org/project/sdb/0.1.0/
The above link is not official but a dry-run before we actually create an entry on PyPI.

= References Used For This Patch

[1] https://packaging.python.org/tutorials/packaging-projects/
[2] https://packaging.python.org/discussions/install-requires-vs-requirements/ and https://stackoverflow.com/questions/14399534/reference-requirements-txt-for-the-install-requires-kwarg-in-setuptools-setup-py

[codecov-io]

Codecov Report

Merging #201 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #201   +/-   ##
=======================================
  Coverage   85.46%   85.46%           
=======================================
  Files          58       58           
  Lines        2346     2346           
=======================================
  Hits         2005     2005           
  Misses        341      341

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