Updating CLI apply to use FeatureStore & remove feature table logic

[adchia]

What this PR does / why we need it:

Moves the feast CLI's apply method (feast apply) to use the SDK FeatureStore class more. This includes some cleanup that also removes obsolete logic around feature tables. Note that because the feast CLI's apply is a total apply whereas the SDK apply is partial, there is still leftover business logic (in particular for deleting entities / FVs that don't match the repo).

Which issue(s) this PR fixes:

Does this PR introduce a user-facing change?:

action required: feature tables were unofficially supported via the CLI and now no longer are

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: adchia
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[adchia]

/assign @jklegar

[codecov-commenter]

Codecov Report

Merging #1741 (24cc75a) into master (95a245a) will decrease coverage by 16.98%.
The diff coverage is 14.28%.

@@             Coverage Diff             @@
##           master    #1741       +/-   ##
===========================================
- Coverage   79.10%   62.11%   -16.99%     
===========================================
  Files          81       79        -2     
  Lines        6938     6834      -104     
===========================================
- Hits         5488     4245     -1243     
- Misses       1450     2589     +1139     

Flag	Coverage Δ
integrationtests	?
unittests	62.11% <14.28%> (+0.17%)	⬆️

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

Impacted Files	Coverage Δ
sdk/python/feast/repo_operations.py	34.32% <9.37%> (+3.13%)	⬆️
sdk/python/feast/feature_store.py	91.25% <66.66%> (-2.39%)	⬇️
.../integration/online_store/test_online_retrieval.py	17.39% <0.00%> (-82.61%)	⬇️
sdk/python/tests/utils/online_read_write_test.py	18.18% <0.00%> (-81.82%)	⬇️
...gration/registration/test_feature_service_apply.py	31.25% <0.00%> (-68.75%)	⬇️
...hon/tests/integration/registration/test_cli_gcp.py	31.70% <0.00%> (-68.30%)	⬇️
...n/tests/integration/registration/test_cli_redis.py	32.55% <0.00%> (-67.45%)	⬇️
sdk/python/feast/infra/online_stores/redis.py	30.35% <0.00%> (-64.29%)	⬇️
sdk/python/feast/infra/online_stores/datastore.py	31.03% <0.00%> (-62.07%)	⬇️
sdk/python/feast/infra/online_stores/dynamodb.py	30.37% <0.00%> (-60.76%)	⬇️
... and 31 more

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[achals]

Looks good to me. I wonder if we should change the apply method on the feature store to be a total apply, or add a total_apply method, so that this logic can be used without relying on repo_operations.

[adchia]

Moving to different PR since I added a dev branch to the main repo