Behavior on STOP_SENDING

[martinduke]

We should probably have some normative text on the reaction to STOP_SENDING. In general, RFC9000 senders should respond to STOP_SENDING with an immediate RESET_STREAM.

If the receiver has indicated it doesn't want the bytes the sender thinks are reliable, what then?

I'm leaning towards sending RESET_STREAM_AT with any desired reliable_size, regardless of receiver intent, but I don't feel strongly about it.