Add DROPTIMEOUTS command
mikeperry kindly implemented a
DROPTIMEOUTS command similar to the existing
DROPGUARDS command but for dropping all computed circuit build timeouts:
https://github.com/mikeperry-tor/tor/commits/droptimeouts provides this functionality.
https://github.com/mikeperry-tor/torspec/commits/droptimeouts provides the spec.
It would be great to have this new command in Tor in order to run OnionPerf experiments where we periodically reset guards and timeouts and wait for new timeouts to be computed.