refactor: Refactor universal test data to have more well defined types

[adchia]

What this PR does / why we need it:
Before, the test data and test objects used for the universal test suite tended to be a Dict[str, Any] with hardcoded keys. This converts those into data classes which allows for much better IDE integrations.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #2340 (55672e5) into master (fdb5f21) will increase coverage by 0.03%.
The diff coverage is 91.83%.

@@            Coverage Diff             @@
##           master    #2340      +/-   ##
==========================================
+ Coverage   86.51%   86.54%   +0.03%     
==========================================
  Files         116      117       +1     
  Lines        9698     9753      +55     
==========================================
+ Hits         8390     8441      +51     
- Misses       1308     1312       +4     

Flag	Coverage Δ
integrationtests	75.54% <91.30%> (-0.11%)	⬇️
unittests	58.46% <60.20%> (+0.17%)	⬆️

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

Impacted Files	Coverage Δ
...marks/test_benchmark_universal_online_retrieval.py	37.03% <40.00%> (+5.03%)	⬆️
sdk/python/feast/diff/registry_diff.py	70.24% <55.55%> (-1.79%)	⬇️
...tegration/offline_store/test_s3_custom_endpoint.py	29.62% <75.00%> (+5.62%)	⬆️
sdk/python/feast/__init__.py	90.90% <100.00%> (+0.43%)	⬆️
sdk/python/feast/feast_object.py	100.00% <100.00%> (ø)
sdk/python/feast/feature_store.py	91.90% <100.00%> (+0.01%)	⬆️
sdk/python/tests/conftest.py	91.83% <100.00%> (-0.25%)	⬇️
...dk/python/tests/integration/e2e/test_validation.py	100.00% <100.00%> (ø)
...ts/integration/feature_repos/repo_configuration.py	96.00% <100.00%> (+1.50%)	⬆️
...fline_store/test_universal_historical_retrieval.py	100.00% <100.00%> (ø)
... and 3 more

---

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[felixwang9817]

btw @adchia looks like unit tests are failing here with AttributeError: module 'functools' has no attribute 'cached_property'; do you want to rebase on master and force push?

[adchia]

btw @adchia looks like unit tests are failing here with AttributeError: module 'functools' has no attribute 'cached_property'; do you want to rebase on master and force push?

done!

[felixwang9817]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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🎉 This PR is included in version 0.19.0 🎉

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