[PECO-1414] Support Databricks native OAuth in Azure

[jackyhu-db]

Support Databricks native OAuth in Azure and use it as the default OAuth U2M provider/flow in Azure.

Databricks now supports native OAuth U2M (user-to-machine) flow in Azure. With databricks-sql-python (Client ID: databricks-sql-python) being enabled by default in every account, we can use Databricks native OAuth as the default OAuth method in Azure. If your application still prefers to use Microsoft Azure AD for authentication, you can simply set auth_type to azure-oauth, as shown below.

connection = sql.connect(
  server_hostname=host,
  http_path=http_path,
 auth_type="azure-oauth")