[#1410] engine: Provide the default implementation to MetricsRegister

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/local_object_storage/engine/engine.go

@@ -219,6 +219,7 @@ func defaultCfg() *cfg {
 	res := &cfg{
 		log:           &logger.Logger{Logger: zap.L()},
 		shardPoolSize: 20,
+		metrics:       noopMetrics{},
 	}
 	res.containerSource.Store(&containerSource{})
 	return res