Changed FVProjection 'name_to_use' field to 'name_alias' and changed '.set_projection' in FeatureView to ".with_projection". Also adjustments for some edge cases

[mavysavydav]

Signed-off-by: David Y Liu davidyliuliu@gmail.com

What this PR does / why we need it: Better style and the change to "with_projection" makes it harder to make mistakes. Adjustments for some edge cases like the following:

FeatureService(
    ...
    features=[
        my_fv[[feature_a]],
        my_fv[[feature_b]].with_name("fv_2")
   ]  
    ...
)

won't work unless get_items() returns a copy of the FV rather than just editing the projection. In this example, when my_fv[[feature_b]] is invoked, it overrides the feature subset in the projection for my_fv[[feature_a]].

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[codecov-commenter]

Codecov Report

Merging #1929 (01b04a3) into master (d0778f7) will decrease coverage by 22.07%.
The diff coverage is 24.56%.

@@             Coverage Diff             @@
##           master    #1929       +/-   ##
===========================================
- Coverage   81.95%   59.87%   -22.08%     
===========================================
  Files          96       96               
  Lines        7557     7576       +19     
===========================================
- Hits         6193     4536     -1657     
- Misses       1364     3040     +1676     

Flag	Coverage Δ
integrationtests	?
unittests	59.87% <24.56%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
...python/feast/infra/offline_stores/offline_utils.py	46.15% <ø> (-43.96%)	⬇️
sdk/python/feast/feature_view.py	74.41% <11.11%> (-9.92%)	⬇️
sdk/python/feast/on_demand_feature_view.py	31.38% <12.00%> (-54.77%)	⬇️
sdk/python/feast/feature_store.py	75.98% <50.00%> (-18.20%)	⬇️
sdk/python/feast/infra/provider.py	84.16% <50.00%> (-5.84%)	⬇️
sdk/python/feast/feature_view_projection.py	68.00% <100.00%> (-32.00%)	⬇️
.../integration/online_store/test_universal_online.py	14.58% <0.00%> (-85.42%)	⬇️
.../integration/online_store/test_online_retrieval.py	17.39% <0.00%> (-82.61%)	⬇️
sdk/python/tests/utils/online_read_write_test.py	18.18% <0.00%> (-81.82%)	⬇️
...fline_store/test_universal_historical_retrieval.py	18.69% <0.00%> (-80.49%)	⬇️
... and 51 more

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[mavysavydav]

these changes made b/c of the possibility of having multiple same feature views with different projections

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[woop]

/lgtm