chore: Add param support for client_request_mfa_token

[vanducng]

This PR adds support for an additional parameter named client_request_mfa_token in the extra_conn for Snowflake connections. This enables MFA caching along with two other setup steps:

• authenticator: username_password_mfa
• ALLOW_CLIENT_MFA_CACHING is set to TRUE

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[potiuk]

Could you please fix the tests ?

[vanducng]

Hi @potiuk, All tests are fixed. Can you please help to review again?