feat(snowflake_hook): Adding oauth support for SnowflakeHook

[Sharashchandra]

This PR enhances the SnowflakeHook in the Airflow repo by completing the OAuth authentication flow. It adds logic to fetch the access token using the refresh_token, client_id, and client_secret, which are already managed in the extras of the Snowflake connection object.

Changes & Fixes:
Implements logic to exchange the refresh_token for a new access token before establishing a connection.
Resolves an issue where using refresh_token, client_id, and client_secret directly with SnowflakeHook results in the error:

snowflake.connector.errors.DatabaseError: 250001 (08001): None: Failed to connect to DB: account.snowflakecomputing.com:443. Invalid OAuth access token.

[boring-cyborg]

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