Add MVP support for on demand transforms for bigquery

[adchia]

Signed-off-by: Danny Chiao [email protected]

What this PR does / why we need it:
Add MVP support for on demand transforms for bigquery

Verified this works properly with an on demand transform that calls to_bigquery. Examined resulting BQ table and observed correct transformation applied.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #1855 (f5e8302) into master (1b809a7) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1855      +/-   ##
==========================================
- Coverage   84.87%   84.79%   -0.08%     
==========================================
  Files          91       91              
  Lines        6961     6967       +6     
==========================================
  Hits         5908     5908              
- Misses       1053     1059       +6     

Flag	Coverage Δ
integrationtests	84.72% <0.00%> (-0.08%)	⬇️
unittests	63.14% <0.00%> (-0.06%)	⬇️

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/bigquery.py	78.66% <0.00%> (-3.28%)	⬇️

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[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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