Odfv logic

[felixwang9817]

What this PR does / why we need it: This PR refactors some of the ODFV logic in get_online_features.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #2088 (5584f2d) into master (54d0f3a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2088   +/-   ##
=======================================
  Coverage   83.44%   83.44%           
=======================================
  Files         100      100           
  Lines        8077     8077           
=======================================
  Hits         6740     6740           
  Misses       1337     1337           

Flag	Coverage Δ
integrationtests	73.87% <100.00%> (ø)
unittests	58.07% <40.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
sdk/python/feast/feature_store.py	90.22% <100.00%> (ø)
.../integration/online_store/test_universal_online.py	97.67% <0.00%> (-0.47%)	⬇️
sdk/python/feast/infra/utils/aws_utils.py	85.50% <0.00%> (+0.72%)	⬆️

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[adchia]

/lgtm

[adchia]

Also, I think this fixes a bug too right? Mind tagging that issue?

[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: achals, adchia, felixwang9817

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blocking merge