feat: update SnowflakeSqlApiHook to support OAuth

[andyguwc]

This PR updates SnowflakeSqlApiHook to support OAuth.

In order to update this hook have to update the SnowflakeHook to parse the refresh token and client credentials.

The OAuth workflow assumes the user already obtained the refresh_token, client_id, and client_secret. In particular the refresh_token should be obtained outside of airflow.

The PR also fixes the snowflake account_identifier used in the hook which used to force a region, but region should be optional in the identifier.

Also tested locally by running the SnowflakeSqlApiOperator operator in example DAG.

closes: #36621

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[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.