fix: make sure that Minestom services are properly shutting down

Unlike CraftBukkit, Minestom does not call System.exit() when shutting down.
Minestom relies on the outside process to release all resources and non-daemon threads so that the process can properly exit.

For reference see net.minecraft.server.dedicated.DedicatedServer#onServerExit which is being called by MinecraftServer#halt which is in turn being handled by MinecraftServer#runServer (second nested finally).

modules/bridge/src/main/java/eu/cloudnetservice/modules/bridge/platform/minestom/MinestomBridgeExtension.java

@@ -16,6 +16,8 @@
 
 package eu.cloudnetservice.modules.bridge.platform.minestom;
 
+import eu.cloudnetservice.common.concurrent.Task;
+import eu.cloudnetservice.driver.network.NetworkClient;
 import eu.cloudnetservice.driver.registry.ServiceRegistry;
 import eu.cloudnetservice.driver.util.ModuleHelper;
 import eu.cloudnetservice.ext.platforminject.api.PlatformEntrypoint;
@@ -49,19 +51,22 @@ public final class MinestomBridgeExtension implements PlatformEntrypoint {
   private final ModuleHelper moduleHelper;
   private final ServiceRegistry serviceRegistry;
   private final MinestomBridgeManagement bridgeManagement;
+  private final NetworkClient networkClient;
 
   @Inject
   public MinestomBridgeExtension(
     @NonNull ComponentLogger logger,
     @NonNull ModuleHelper moduleHelper,
     @NonNull ServiceRegistry serviceRegistry,
     @NonNull MinestomBridgeManagement bridgeManagement,
-    @NonNull MinestomPlayerManagementListener playerListener
+    @NonNull MinestomPlayerManagementListener playerListener,
+    @NonNull NetworkClient networkClient
   ) {
     this.logger = logger;
     this.moduleHelper = moduleHelper;
     this.serviceRegistry = serviceRegistry;
     this.bridgeManagement = bridgeManagement;
+    this.networkClient = networkClient;
   }
 
   @Override
@@ -84,5 +89,15 @@ public void onLoad() {
   @Override
   public void onDisable() {
     this.moduleHelper.unregisterAll(this.getClass().getClassLoader());
+    try {
+      this.networkClient.close();
+    } catch (Exception exception) {
+      this.logger.error("Exception while closing network client", exception);
+    }
+    try {
+      Task.shutdownNow();
+    } catch (InterruptedException exception) {
+      this.logger.error("Exception while shutting down task executor", exception);
+    }
   }
 }