chore: Assorted updates to feast packaging

[achals]

https://packaging.python.org/en/latest/tutorials/packaging-projects/

• pyproject.toml is the preferred way to setting up packaging for python now.
• Additionally, we should try to use replacements for pkg_resources wherever possible: https://github.com/pypa/setuptools/milestone/4

Signed-off-by: Achal Shah [email protected]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[codecov-commenter]

Codecov Report

Merging #2683 (4209a5a) into master (01d3568) will increase coverage by 0.00%.
The diff coverage is 84.61%.

@@           Coverage Diff           @@
##           master    #2683   +/-   ##
=======================================
  Coverage   80.99%   81.00%           
=======================================
  Files         166      166           
  Lines       13872    13879    +7     
=======================================
+ Hits        11236    11242    +6     
- Misses       2636     2637    +1     

Flag	Coverage Δ
integrationtests	71.53% <76.92%> (-0.23%)	⬇️
unittests	58.70% <84.61%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdk/python/feast/version.py	80.00% <83.33%> (+8.57%)	⬆️
sdk/python/feast/__init__.py	92.59% <85.71%> (+1.28%)	⬆️
...ython/feast/embedded_go/online_features_service.py	89.65% <0.00%> (-0.87%)	⬇️

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[adchia]

/lgtm

[adchia]

/lgtm

[feast-ci-bot]

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