Adding a local feature server test

[adchia]

What this PR does / why we need it:
We've run into issues debugging the lambda test, so introducing a local feature server that is instantiated on tests that have python_feature_server=True on a local provider.

This also logs the stack trace on the feature server. This was useful in debugging #2202

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #2217 (d125103) into master (1b98ec9) will decrease coverage by 0.08%.
The diff coverage is 30.30%.

@@            Coverage Diff             @@
##           master    #2217      +/-   ##
==========================================
- Coverage   59.83%   59.75%   -0.09%     
==========================================
  Files         105      105              
  Lines        8453     8480      +27     
==========================================
+ Hits         5058     5067       +9     
- Misses       3395     3413      +18     

Flag	Coverage Δ
unittests	59.75% <30.30%> (-0.09%)	⬇️

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

Impacted Files	Coverage Δ
...tegration/feature_repos/universal/feature_views.py	36.66% <ø> (ø)
.../integration/online_store/test_universal_online.py	15.20% <0.00%> (-0.15%)	⬇️
...ts/integration/feature_repos/repo_configuration.py	45.19% <30.76%> (-1.55%)	⬇️
sdk/python/tests/conftest.py	59.40% <33.33%> (-3.52%)	⬇️
sdk/python/feast/feature_server.py	32.50% <50.00%> (+1.73%)	⬆️

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[judahrand]

This looks like it'll make server development way easier! Awesome.

Test failures look like the class AWS failures.

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[judahrand]

/lgtm