v4.0.0

Whats changed

• Split the connector into two separate packages: databricks-sql-connector and databricks-sqlalchemy. The databricks-sql-connector package contains the core functionality of the connector, while the databricks-sqlalchemy Github contains the SQLAlchemy dialect for the connector. (#444 by @jprakash-db)
• Pyarrow dependency is now optional in databricks-sql-connector. Users needing arrow are supposed to explicitly install pyarrow

Full Changelog: v3.6.0...v4.0.0