Changes to Create a Gmail draft or threaded reply with optional workspace attachments

added the optional property anyOf[#/components/schemas/InvalidRequestError]/message to the response with the 400 status

the endpoint scheme security bearerAuth was added to the API

the endpoint scheme security denApiKey was added to the API

added the new optional request property attachments

added the non-success response with the status 422

added the optional property anyOf[#/components/schemas/InvalidRequestError]/capability to the response with the 400 status