Changes to Authorize an App

added the new optional request property mcp_client

the request property code_challenge became optional

the request property code_challenge_method became optional

added the non-success response with the status 409

added the optional property error/code to the response with the 400 status

added the optional property error/code to the response with the 401 status

added the optional property error/code to the response with the 403 status

added the optional property error/code to the response with the 404 status

endpoint added