Add vertex feature store integration

[eliasecchig]

Authors: @lspataroG @eliasecchig

Add VertexAI Langchain integration

Example usage

[lkuligin]

/gcbrun

[eliasecchig]

/gcbrun

[lkuligin]

/gcbrun

[lspataroG]

/gcbrun

[lkuligin]

/gcbrun

[gmogr]

In integration tests could you please add a check for already created datasets in BQ. tests/integration_tests/vectorstores/feature_store/test_feature_store_fs_executor.py are failing if BQ dataset is already created.

[eliasecchig]

@gmogr can you link an example where tests failed? If dataset already exists, the class should not complain about it, see here

[lspataroG]

@gmogr Added teardown for feature view.

[eliasecchig]

/gcbrun

[gmogr]

/gcbrun