chore: Add a source field in the feature view API

[achals]

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

What this PR does / why we need it:
Building off #2523 , this PR adds a new source field to the FeatureView API.
Which issue(s) this PR fixes:

Fixes #

[codecov-commenter]

Codecov Report

Merging #2525 (cb5b31b) into master (6a03bed) will decrease coverage by 0.05%.
The diff coverage is 90.47%.

@@            Coverage Diff             @@
##           master    #2525      +/-   ##
==========================================
- Coverage   81.99%   81.93%   -0.06%     
==========================================
  Files         140      140              
  Lines       11745    11757      +12     
==========================================
+ Hits         9630     9633       +3     
- Misses       2115     2124       +9     

Flag	Coverage Δ
integrationtests	73.96% <90.47%> (-0.30%)	⬇️
unittests	57.51% <52.38%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
...tegration/feature_repos/universal/feature_views.py	83.07% <ø> (ø)
sdk/python/feast/feature_view.py	86.90% <90.47%> (+1.00%)	⬆️
sdk/python/feast/wait.py	58.82% <0.00%> (-35.30%)	⬇️
...ython/feast/embedded_go/online_features_service.py	96.42% <0.00%> (-0.90%)	⬇️
.../integration/online_store/test_universal_online.py	92.85% <0.00%> (-0.58%)	⬇️

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[felixwang9817]

just one nit

[felixwang9817]

also should we update docs and tests here?

[achals]

Yeah, I'll update docs (and tests)

[adchia]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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