Remove unsupported java parts

[pyalex]

Signed-off-by: pyalex [email protected]

What this PR does / why we need it:

This PR refactors java code in accordance with Feast roadmap:

• Java core service is removed (including authentication and authorization) since its functionality implemented in Python SDK
• Serving service now depends only on Registry (produced by Python SDK) as Specifications provider

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #2029 (92973f6) into master (63680ba) will decrease coverage by 22.88%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #2029       +/-   ##
===========================================
- Coverage   83.23%   60.34%   -22.89%     
===========================================
  Files         103      103               
  Lines        8421     8421               
===========================================
- Hits         7009     5082     -1927     
- Misses       1412     3339     +1927     

Flag	Coverage Δ
integrationtests	?
unittests	60.34% <ø> (ø)

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

Impacted Files	Coverage Δ
.../integration/online_store/test_universal_online.py	14.06% <0.00%> (-84.90%)	⬇️
.../integration/online_store/test_online_retrieval.py	17.39% <0.00%> (-82.61%)	⬇️
...fline_store/test_universal_historical_retrieval.py	19.29% <0.00%> (-80.12%)	⬇️
sdk/python/tests/utils/online_read_write_test.py	20.68% <0.00%> (-79.32%)	⬇️
...gration/registration/test_feature_service_apply.py	31.25% <0.00%> (-68.75%)	⬇️
sdk/python/feast/infra/online_stores/redis.py	26.97% <0.00%> (-67.11%)	⬇️
sdk/python/tests/data/data_creator.py	34.78% <0.00%> (-65.22%)	⬇️
sdk/python/tests/integration/e2e/test_usage_e2e.py	35.00% <0.00%> (-65.00%)	⬇️
...s/integration/registration/test_universal_types.py	36.73% <0.00%> (-63.27%)	⬇️
sdk/python/feast/infra/online_stores/datastore.py	32.28% <0.00%> (-61.42%)	⬇️
... and 49 more

---

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[adchia]

leaving a comment here but letting this merge to fix test. We might want to consider having charts, etc within the java subdirectory since there is an analagous sdk/python/feast/infra directory. Could see it going either way though

[adchia]

/lgtm

[adchia]

assuming this can just be removed? but letting merge since it also fixes tests

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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