Allow using cached registry when writing to the online store

[achals]

Signed-off-by: Achal Shah achals@gmail.com

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #2051

Does this PR introduce a user-facing change?:

Use cached registry to speed up direct writes to the online store

[felixwang9817]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[codecov-commenter]

Codecov Report

Merging #2066 (e51fe64) into master (f2f5dc6) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master    #2066   +/-   ##
=======================================
  Coverage   58.21%   58.22%           
=======================================
  Files         100      100           
  Lines        8078     8076    -2     
=======================================
- Hits         4703     4702    -1     
+ Misses       3375     3374    -1     

Flag	Coverage Δ
unittests	58.22% <66.66%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
sdk/python/feast/feature_store.py	70.88% <0.00%> (ø)
sdk/python/feast/registry.py	70.27% <100.00%> (ø)
sdk/python/tests/conftest.py	68.83% <0.00%> (-1.30%)	⬇️
sdk/python/feast/infra/online_stores/datastore.py	32.80% <0.00%> (+0.51%)	⬆️

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[felixwang9817]

/lgtm

[felixwang9817]

/kind housekeeping