Limit database connections (#980, #564) (#998)

* Limit database connections (#564)

- Add new options to the config file database:
      max_open_conns: 100
      max_idle_conns: 2
      conn_max_lifetime: -1
- Implement connection parameter setup on the *DB (database/sql) in internal/sqlutil/trace.go:Open()
- Propagate the values in the form of DbProperties interface via all the
  Open() and NewDatabase() functions

Signed-off-by: Tomas Jirka <tomas.jirka@email.cz>

* Fix wasm builds

* Remove file accidentally added from working tree

Co-authored-by: Tomas Jirka <tomas.jirka@email.cz>

roomserver/roomserver.go

@@ -35,7 +35,7 @@ func SetupRoomServerComponent(
 	keyRing gomatrixserverlib.JSONVerifier,
 	fedClient *gomatrixserverlib.FederationClient,
 ) api.RoomserverInternalAPI {
-	roomserverDB, err := storage.Open(string(base.Cfg.Database.RoomServer))
+	roomserverDB, err := storage.Open(string(base.Cfg.Database.RoomServer), base.Cfg.DbProperties())
 	if err != nil {
 		logrus.WithError(err).Panicf("failed to connect to room server db")
 	}