feat: Clickhouse offline store

[iamhatesz]

What this PR does / why we need it:

This PR adds a new contrib offline store backed by Clickhouse.

Which issue(s) this PR fixes:

Lack of Clickhouse support :)

Misc

The implementation is heavily based on the Postgres store and tested against it. The resulting features were identical to the point that it's possible with two different backends (e.g., different data types).

I added a helper to run integration tests: make test-python-universal-clickhouse-offline. Unfortunately, 3 test cases are failing:

ERROR sdk/python/tests/integration/registration/test_universal_types.py::test_feature_get_historical_features_types_match[TypeTestConfig(feature_dtype='float', feature_is_list=True, has_empty_list=False)-ParameterSet(values=(LOCAL:Clickhouse:RedisOnlineStoreCreator:python_fs:False,), marks=[], id=None)] - TypeError: object of type 'NoneType' has no len()
ERROR sdk/python/tests/integration/registration/test_universal_types.py::test_feature_get_historical_features_types_match[TypeTestConfig(feature_dtype='bool', feature_is_list=True, has_empty_list=False)-ParameterSet(values=(LOCAL:Clickhouse:RedisOnlineStoreCreator:python_fs:False,), marks=[], id=None)] - TypeError: object of type 'NoneType' has no len()
ERROR sdk/python/tests/integration/registration/test_universal_types.py::test_feature_get_historical_features_types_match[TypeTestConfig(feature_dtype='datetime', feature_is_list=True, has_empty_list=False)-ParameterSet(values=(LOCAL:Clickhouse:RedisOnlineStoreCreator:python_fs:False,), marks=[], id=None)] - TypeError: object of type 'NoneType' has no len()

This is because Clickhouse doesn't support Nullable(Array(...)) type. I could have added test_universal_types to the ignore list, but I thought it's worth keeping it on, as many other test cases from this test are passing.