Implement diff_infra_protos method for feast plan

[felixwang9817]

What this PR does / why we need it: This PR implements the diff_infra_protos, which will compute the difference between two InfraProto objects, for feast plan.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #2204 (31d01b5) into master (b4d12bd) will decrease coverage by 24.80%.
The diff coverage is 91.90%.

@@             Coverage Diff             @@
##           master    #2204       +/-   ##
===========================================
- Coverage   84.46%   59.66%   -24.81%     
===========================================
  Files         104      105        +1     
  Lines        8247     8387      +140     
===========================================
- Hits         6966     5004     -1962     
- Misses       1281     3383     +2102     

Flag	Coverage Δ
integrationtests	?
unittests	59.66% <91.90%> (+1.01%)	⬆️

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

Impacted Files	Coverage Δ
sdk/python/feast/infra/online_stores/sqlite.py	85.59% <44.44%> (-2.24%)	⬇️
sdk/python/feast/infra/online_stores/datastore.py	40.19% <55.55%> (-42.81%)	⬇️
sdk/python/feast/infra/infra_object.py	71.73% <88.88%> (+14.23%)	⬆️
sdk/python/feast/diff/infra_diff.py	96.82% <100.00%> (+11.82%)	⬆️
sdk/python/feast/infra/online_stores/dynamodb.py	42.64% <100.00%> (-37.81%)	⬇️
sdk/python/tests/unit/diff/test_infra_diff.py	100.00% <100.00%> (ø)
.../integration/online_store/test_universal_online.py	15.34% <0.00%> (-82.80%)	⬇️
.../integration/online_store/test_online_retrieval.py	17.39% <0.00%> (-82.61%)	⬇️
...fline_store/test_universal_historical_retrieval.py	19.18% <0.00%> (-80.82%)	⬇️
sdk/python/tests/utils/online_read_write_test.py	20.68% <0.00%> (-79.32%)	⬇️
... and 58 more

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[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [felixwang9817]

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[pyalex]

/lgtm