Remove unsupported java parts

[pyalex]

Signed-off-by: pyalex moskalenko.alexey@gmail.com

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

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 63680ba...92973f6. Read the comment docs.

[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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [adchia]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment