chore: Add types hints and set created_timestamp in sql registry

[achals]

Signed-off-by: Achal Shah [email protected]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[codecov-commenter]

Codecov Report

Merging #3033 (7f8d7bb) into master (4bba787) will increase coverage by 9.92%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3033      +/-   ##
==========================================
+ Coverage   67.72%   77.64%   +9.92%     
==========================================
  Files         167      194      +27     
  Lines       14679    16114    +1435     
==========================================
+ Hits         9941    12512    +2571     
+ Misses       4738     3602    -1136     

Flag	Coverage Δ
integrationtests	67.49% <0.00%> (-0.23%)	⬇️
unittests	59.33% <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/registry_stores/sql.py	72.75% <100.00%> (+39.87%)	⬆️
sdk/python/tests/unit/test_sql_registry.py	94.11% <100.00%> (+68.71%)	⬆️
...python/feast/infra/offline_stores/offline_store.py	83.00% <0.00%> (-1.54%)	⬇️
sdk/python/tests/utils/e2e_test_validation.py	88.88% <0.00%> (ø)
sdk/python/tests/integration/e2e/test_usage_e2e.py	100.00% <0.00%> (ø)
...n/tests/integration/materialization/test_lambda.py	100.00% <0.00%> (ø)
...n/tests/integration/registration/test_inference.py	100.00% <0.00%> (ø)
...sts/integration/registration/test_feature_store.py	100.00% <0.00%> (ø)
...ts/integration/feature_repos/repo_configuration.py	86.51% <0.00%> (ø)
sdk/python/feast/transformation_server.py	40.47% <0.00%> (ø)
... and 100 more

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[felixwang9817]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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