Add OAuth2 authentication parameters for SMTP connections

[KalinduGandara]

This pull request updates the Email Connector documentation to improve and clarify OAuth2 authentication support. The main changes include expanding protocol support for OAuth2 and adding detailed configuration parameters.

OAuth2 Authentication Enhancements:

• Updated the documentation to specify that OAuth2 authentication is now supported for IMAP, IMAPS, and SMTPS connections (previously, only IMAP and IMAPS were mentioned).
• Added a new section to the connection configuration parameters table detailing all OAuth2-related configuration options, including enabling OAuth2, grant type, client credentials, token URL, and scope.

Fixes: wso2/product-integrator-mi#4772

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