MINOR: debug: add a new "debug dev stream" command

MINOR: debug: add a new "debug dev stream" command

This new "debug dev stream" command allows to manipulate flags, timeouts,
states for streams, channels and stream interfaces, as well as waking a
stream up. These may be used to help reproduce certain bugs during
development. The operations are performed to the stream assigned by
"strm" which defaults to the CLI's stream. This stream pointer can be
chosen from one of those reported in "show sess". Example:

  socat - /tmp/sock1 <<< "debug dev stream strm=0x1555b80 req.f=-1 req.r=now wake"