FrameResponse creates a backend.DataResponse that contains the Framer's data.Frames.

FrameResponseWithError creates a backend.DataResponse with the error's contents (if not nil), and the Framer's data.Frames This function is particularly useful if you have a function that returns `(Framer, error)`, which is a very common pattern.

Framer is an interface that allows any type to be treated as a data frame.