Add Registry and CLI operations for on demand feature views

[achals]

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

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

Add Registry and CLI operations for on demand feature views

[codecov-commenter]

Codecov Report

Merging #1828 (e479e3e) into master (9dc9e60) will decrease coverage by 0.06%.
The diff coverage is 45.09%.

@@            Coverage Diff             @@
##           master    #1828      +/-   ##
==========================================
- Coverage   84.60%   84.54%   -0.07%     
==========================================
  Files          94       94              
  Lines        6946     7228     +282     
==========================================
+ Hits         5877     6111     +234     
- Misses       1069     1117      +48     

Flag	Coverage Δ
integrationtests	84.47% <45.09%> (+0.20%)	⬆️
unittests	63.20% <41.17%> (-0.18%)	⬇️

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

Impacted Files	Coverage Δ
sdk/python/feast/cli.py	42.58% <33.33%> (-1.38%)	⬇️
sdk/python/feast/errors.py	67.96% <40.00%> (-1.43%)	⬇️
sdk/python/feast/registry.py	78.30% <61.53%> (-1.00%)	⬇️
sdk/python/feast/feature_store.py	92.66% <66.66%> (-0.49%)	⬇️
sdk/python/feast/infra/offline_stores/redshift.py	89.54% <0.00%> (-0.75%)	⬇️
...python/feast/infra/offline_stores/offline_store.py	84.00% <0.00%> (ø)
sdk/python/feast/infra/offline_stores/file.py	97.61% <0.00%> (+0.47%)	⬆️
sdk/python/feast/infra/provider.py	89.58% <0.00%> (+0.79%)	⬆️
sdk/python/feast/infra/offline_stores/bigquery.py	83.82% <0.00%> (+3.52%)	⬆️

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[adchia]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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