feat: Add config key for connect_arg for SqlAlchemyExtractor

[benrifkind]

Summary of Changes

I added a config key for the SQLAlchemyExtractor that lets the user specify general connect_args for the sqlalchemy.create_engine function. I did this because I want to use the SQLAlchemyExtractor for Presto and I have an https connection so I need to pass the kwarg connect_args={"protocol": "https"} into create_engine.

Tests

I added the test: test_get_connection in tests/unit/extractor/test_sql_alchemy_extractor.py

Documentation

I did not add any documentation

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[feng-tao]

looks good

[feng-tao]

hey @benrifkind , do you think you could fix the DCO check by running git commit --amend --no-edit --signoff ? thanks.

[benrifkind]

Sorry about that. I fixed the DCO check.

[feng-tao]

no worry