Add FeatureService proto definition

[achals]

Signed-off-by: Achal Shah [email protected]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #1572

Does this PR introduce a user-facing change?:

Introduce FeatureService to group Feature references

[codecov-commenter]

Codecov Report

Merging #1676 (ab4b248) into master (cb1e7d7) will decrease coverage by 0.13%.
The diff coverage is 54.54%.

@@            Coverage Diff             @@
##           master    #1676      +/-   ##
==========================================
- Coverage   82.70%   82.56%   -0.14%     
==========================================
  Files          75       76       +1     
  Lines        6665     6698      +33     
==========================================
+ Hits         5512     5530      +18     
- Misses       1153     1168      +15     

Flag	Coverage Δ
integrationtests	82.48% <54.54%> (-0.14%)	⬇️
unittests	69.65% <54.54%> (-0.08%)	⬇️

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

Impacted Files	Coverage Δ
sdk/python/feast/feature_view.py	85.24% <25.00%> (-4.23%)	⬇️
sdk/python/feast/feature_view_projection.py	59.09% <59.09%> (ø)
...dk/python/tensorflow_metadata/proto/v0/path_pb2.py	100.00% <100.00%> (ø)
.../python/tensorflow_metadata/proto/v0/schema_pb2.py	100.00% <100.00%> (ø)
...hon/tensorflow_metadata/proto/v0/statistics_pb2.py	100.00% <100.00%> (ø)

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[woop]

If we fix entities then I think we're good.

[woop]

/lgtm

Oops, we're still planning to rename FeatureReference.

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[woop]

Btw @achals, if your PR has "Fixes #[0-9]+", then it will actually close the corresponding issue when the PR lands.