Is your feature request related to a problem? Please describe.

A handler can gracefully force the process to be restarted by returning a messages.InvokeResponse_Error with ShouldExit = true. The usual way this happens is when the function panics, but pass-through is allowed too on the handler's error value

However, there's not an equivalent when the response value is a reader.

Describe the solution you'd like

Goal should be able to make this:

type fatalReader struct{}
func (r *fatalReader) Read(_ []byte) (int, error) {
  return 0, messages.InvokeResponse_Error{Type: "IDK", Message: "fatal", ShouldExit: true}
}
func handler() (any, error) {
  return fatalReader{}, nil
}

result in the same logging and error reporting as this:

func hander() (any, error) {
  return nil, messages.InvokeResponse_Error{Type: "IDK", Message: "fatal", ShouldExit: true}
}

Describe alternatives you've considered

Might also expose something like