Add on_kill equivalent to Databricks SQL Hook to cancel timed out queries

[R7L208]

The Databricks Provider did not implement a mechanism to cancel SQL queries submitted by DatabricksSqlHook. This led to data quality issues, where Airflow would report a cancellation due to timeout; however, the corresponding SQL query would continue to run on Databricks.

This PR uses threading to cancel SQL queries submitted by DatabricksSqlHook.run() once the timeout is exceeded.

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