Refactor providers to remove duplicate implementations

[achals]

Signed-off-by: Achal Shah achals@gmail.com

What this PR does / why we need it:

Currently, the AWS, GCP and Local providers have the exact same implementation - and the implementation only defers actual business logic of setting up infrastructure and materializing data to the offline/online store interfaces.

This is confusing for users, and is unnecessary code to maintain. Instead, this PR refactors the implementations into a single implementation, with a dummy subclass for the 3 existing providers for backwards compatibility.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

none

[codecov-commenter]

Codecov Report

Merging #1876 (6ab8c3f) into master (8a49a65) will decrease coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1876      +/-   ##
==========================================
- Coverage   83.96%   83.81%   -0.16%     
==========================================
  Files          95       96       +1     
  Lines        7392     7316      -76     
==========================================
- Hits         6207     6132      -75     
+ Misses       1185     1184       -1     

Flag	Coverage Δ
integrationtests	74.48% <100.00%> (-0.25%)	⬇️
unittests	62.35% <100.00%> (+0.27%)	⬆️

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

Impacted Files	Coverage Δ
sdk/python/feast/infra/aws.py	81.66% <100.00%> (-7.23%)	⬇️
sdk/python/feast/infra/gcp.py	87.50% <100.00%> (-5.29%)	⬇️
sdk/python/feast/infra/local.py	86.36% <100.00%> (-6.14%)	⬇️
sdk/python/feast/infra/passthrough_provider.py	100.00% <100.00%> (ø)
sdk/python/feast/infra/provider.py	90.43% <100.00%> (+0.35%)	⬆️

---

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[woop]

Would you mind adding a description to your PR please?

[adchia]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: achals, adchia

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[feast-ci-bot]

New changes are detected. LGTM label has been removed.

[achals]

Would you mind adding a description to your PR please?

Done