Speed up start up time by batch querying ACL events (#3334)

This should significantly speed up start up times on servers with many
rooms.

roomserver/internal/input/input_events.go

@@ -24,6 +24,7 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/matrix-org/dendrite/roomserver/storage/tables"
 	"github.com/tidwall/gjson"
 
 	"github.com/matrix-org/gomatrixserverlib"
@@ -509,7 +510,13 @@ func (r *Inputer) processRoomEvent(
 					logrus.WithError(err).Error("failed to get server ACLs")
 				}
 				if aclEvent != nil {
-					r.ACLs.OnServerACLUpdate(aclEvent)
+					strippedEvent := tables.StrippedEvent{
+						RoomID:       aclEvent.RoomID().String(),
+						EventType:    aclEvent.Type(),
+						StateKey:     *aclEvent.StateKey(),
+						ContentValue: string(aclEvent.Content()),
+					}
+					r.ACLs.OnServerACLUpdate(strippedEvent)
 				}
 			}
 		}