Add support for multiple entities in Redshift

[felixwang9817]

What this PR does / why we need it: The current Redshift historical retrieval query does not support using multiple entities. This PR fixes that.

Which issue(s) this PR fixes:

Fixes #1816

Does this PR introduce a user-facing change?:

Users can now use multiple entities for historical retrieval on Redshift

[codecov-commenter]

Codecov Report

Merging #1850 (f84fef3) into master (32d5c6c) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1850      +/-   ##
==========================================
+ Coverage   84.92%   84.97%   +0.04%     
==========================================
  Files          92       92              
  Lines        7185     7202      +17     
==========================================
+ Hits         6102     6120      +18     
+ Misses       1083     1082       -1     

Flag	Coverage Δ
integrationtests	84.90% <100.00%> (+0.04%)	⬆️
unittests	62.60% <12.50%> (-0.15%)	⬇️

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

Impacted Files	Coverage Δ
sdk/python/feast/infra/offline_stores/redshift.py	84.87% <ø> (ø)
sdk/python/feast/infra/online_stores/helpers.py	86.20% <100.00%> (-0.46%)	⬇️
...ts/integration/feature_repos/repo_configuration.py	100.00% <100.00%> (ø)
...tegration/feature_repos/universal/feature_views.py	96.66% <100.00%> (+0.23%)	⬆️
...fline_store/test_universal_historical_retrieval.py	99.18% <100.00%> (+0.04%)	⬆️
.../integration/online_store/test_universal_online.py	100.00% <100.00%> (ø)
sdk/python/feast/infra/provider.py	90.08% <0.00%> (+0.82%)	⬆️

---

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[felixwang9817]

/kind bug

[felixwang9817]

/retest

[felixwang9817]

/retest

[felixwang9817]

/retest

[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[felixwang9817]

/lgtm

[feast-ci-bot]

@felixwang9817: you cannot LGTM your own PR.

In response to this:

/lgtm

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