Add AS specific public room list endpoints (#2836)

Adds `PUT
/_matrix/client/v3/directory/list/appservice/{networkId}/{roomId}` and
`DELTE
/_matrix/client/v3/directory/list/appservice/{networkId}/{roomId}`
support, as well as the ability to filter `/publicRooms` on networkID
and including all networks.

roomserver/api/perform.go

@@ -168,8 +168,10 @@ type PerformBackfillResponse struct {
 }
 
 type PerformPublishRequest struct {
-	RoomID     string
-	Visibility string
+	RoomID       string
+	Visibility   string
+	AppserviceID string
+	NetworkID    string
 }
 
 type PerformPublishResponse struct {