Add a description field the Feature Service class and proto

[achals]

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

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #1770

Does this PR introduce a user-facing change?:

Added a description field to the Feature Service class and proto

[codecov-commenter]

Codecov Report

Merging #1771 (c985ae5) into master (316aabb) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1771      +/-   ##
==========================================
+ Coverage   84.73%   84.76%   +0.02%     
==========================================
  Files          85       86       +1     
  Lines        6297     6308      +11     
==========================================
+ Hits         5336     5347      +11     
  Misses        961      961              

Flag	Coverage Δ
integrationtests	84.68% <100.00%> (+0.02%)	⬆️
unittests	64.31% <100.00%> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
sdk/python/feast/feature_service.py	72.85% <100.00%> (+1.64%)	⬆️
sdk/python/tests/unit/test_feature_service.py	100.00% <100.00%> (ø)

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[felixwang9817]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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