refactor: Delete properties

[felixwang9817]

What this PR does / why we need it: This PR deletes unnecessary properties, and instead makes the attributes public.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #2338 (dc31782) into master (412d625) will decrease coverage by 27.92%.
The diff coverage is 69.86%.

@@             Coverage Diff             @@
##           master    #2338       +/-   ##
===========================================
- Coverage   86.33%   58.41%   -27.93%     
===========================================
  Files         116      116               
  Lines        9886     9673      -213     
===========================================
- Hits         8535     5650     -2885     
- Misses       1351     4023     +2672     

Flag	Coverage Δ
integrationtests	?
unittests	58.41% <69.86%> (-0.47%)	⬇️

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

Impacted Files	Coverage Δ
...thon/feast/infra/offline_stores/bigquery_source.py	44.55% <0.00%> (-42.37%)	⬇️
...thon/feast/infra/offline_stores/redshift_source.py	48.11% <0.00%> (-38.50%)	⬇️
...hon/feast/infra/offline_stores/snowflake_source.py	49.55% <0.00%> (-38.68%)	⬇️
sdk/python/feast/data_source.py	54.33% <63.63%> (-6.23%)	⬇️
sdk/python/feast/feature_service.py	63.63% <93.33%> (-24.33%)	⬇️
sdk/python/feast/entity.py	90.47% <94.11%> (+1.58%)	⬆️
sdk/python/feast/base_feature_view.py	57.50% <100.00%> (-21.45%)	⬇️
...k/python/feast/infra/offline_stores/file_source.py	82.29% <100.00%> (-6.93%)	⬇️
sdk/python/feast/registry.py	67.71% <100.00%> (-18.29%)	⬇️
.../integration/online_store/test_online_retrieval.py	17.39% <0.00%> (-82.61%)	⬇️
... and 70 more

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[adchia]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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