Add auth provider

[frgarciames]

Motivation and Context

Sometimes the executor of the tool could be outside the frontend application. It would be so useful if we can get the auth provider info (tokens, client_id, etc), so we can send it to the executor of the tool (a separated backend application for example).

How Has This Been Tested?

N/A

Breaking Changes

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context