MSC2836 threading: part 2 (#1596)

* Update GMSL

* Add MSC2836EventRelationships to fedsender

* Call MSC2836EventRelationships in reqCtx

* auth remote servers

* Extract room ID and servers from previous events; refactor a bit

* initial cut of federated threading

* Use the right client/fed struct in the response

* Add QueryAuthChain for use with MSC2836

* Add auth chain to federated response

* Fix pointers

* under CI: more logging and enable mscs, nil fix

* Handle direction: up

* Actually send message events to the roomserver..

* Add children and children_hash to unsigned, with tests

* Add logic for exploring threads and tracking children; missing storage functions

* Implement storage functions for children

* Add fetchUnknownEvent

* Do federated hits for include_children if we have unexplored children

* Use /ev_rel rather than /event as the former includes child metadata

* Remove cross-room threading impl

* Enable MSC2836 in the p2p demo

* Namespace mscs db

* Enable msc2836 for ygg

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

roomserver/internal/input/input.go

@@ -62,10 +62,10 @@ func (w *inputWorker) start() {
 	for {
 		select {
 		case task := <-w.input:
-			hooks.Run(hooks.KindNewEventReceived, &task.event.Event)
+			hooks.Run(hooks.KindNewEventReceived, task.event.Event)
 			_, task.err = w.r.processRoomEvent(task.ctx, task.event)
 			if task.err == nil {
-				hooks.Run(hooks.KindNewEventPersisted, &task.event.Event)
+				hooks.Run(hooks.KindNewEventPersisted, task.event.Event)
 			}
 			task.wg.Done()
 		case <-time.After(time.Second * 5):