Refactoring of Notification system

src/main/kotlin/fr/dcproject/common/utils/Ktor.kt

@@ -0,0 +1,10 @@
+package fr.dcproject.common.utils
+
+import io.ktor.application.Application
+import io.ktor.application.ApplicationStopped
+
+fun Application.onApplicationStopped(callback: Application.() -> Unit) {
+    environment.monitor.subscribe(ApplicationStopped) {
+        callback()
+    }
+}