Changes to Creates an empty connection and returns it's id

added the non-success response with the status 400

added the non-success response with the status 403

added the optional property fromConnector/methods/items/connector to the response with the 200 status

added the optional property fromConnector/methods/items/methodType to the response with the 200 status

added the optional property toConnector/methods/items/connector to the response with the 200 status

added the optional property toConnector/methods/items/methodType to the response with the 200 status