GODT-919 GODT-1022 GODT-947 Logs and signals

+ Added startup logs
+ Added wait group for update notifications
+ Changed hooks in debug and trace level

internal/frontend/frontend.go

@@ -45,6 +45,7 @@ type Frontend interface {
 	SetVersion(update updater.VersionInfo)
 	NotifySilentUpdateInstalled()
 	NotifySilentUpdateError(error)
+	WaitUntilFrontendIsReady()
 }
 
 // New returns initialized frontend based on `frontendType`, which can be `cli` or `qt`.