chore: Remove __init__.py for batch materialization engines

[felixwang9817]

Signed-off-by: Felix Wang wangfelix98@gmail.com

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[achals]

/lgtm

[kevjumba]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: achals, felixwang9817, kevjumba

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[codecov-commenter]

Codecov Report

Merging #3133 (d10a230) into master (66ee5d8) will increase coverage by 9.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3133      +/-   ##
==========================================
+ Coverage   67.10%   76.12%   +9.01%     
==========================================
  Files         177      211      +34     
  Lines       15893    17836    +1943     
==========================================
+ Hits        10665    13577    +2912     
+ Misses       5228     4259     -969     

Flag	Coverage Δ
integrationtests	66.91% <50.00%> (-0.19%)	⬇️
unittests	58.24% <100.00%> (?)

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

Impacted Files	Coverage Δ
sdk/python/feast/infra/passthrough_provider.py	96.29% <ø> (-0.03%)	⬇️
sdk/python/feast/repo_config.py	87.83% <ø> (+5.32%)	⬆️
...python/feast/infra/materialization/local_engine.py	90.47% <100.00%> (ø)
sdk/python/tests/doctest/test_all.py	90.47% <100.00%> (+73.80%)	⬆️
...on/feast/infra/materialization/snowflake_engine.py	92.61% <0.00%> (-0.44%)	⬇️
sdk/python/feast/loaders/yaml.py	18.18% <0.00%> (ø)
...ontrib/postgres_offline_store/tests/data_source.py	51.02% <0.00%> (ø)
...ib/trino_offline_store/test_config/manual_tests.py	33.33% <0.00%> (ø)
...offline_stores/contrib/trino_repo_configuration.py	20.00% <0.00%> (ø)
...ffline_stores/contrib/athena_repo_configuration.py	50.00% <0.00%> (ø)
... and 103 more

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