Add temporary backwards compatability for ServerHelper

src/main/java/emu/grasscutter/plugin/api/ServerHook.java

@@ -0,0 +1,30 @@
+package emu.grasscutter.plugin.api;
+
+import emu.grasscutter.server.game.GameServer;
+import emu.grasscutter.server.http.HttpServer;
+
+@Deprecated(since = "2.0.0", forRemoval = true)
+public final class ServerHook extends ServerHelper {
+    private static ServerHook instance;
+
+    /**
+     * Hooks into a server.
+     *
+     * @param gameServer The game server to hook into.
+     * @param httpServer The HTTP server to hook into.
+     */
+    public ServerHook(GameServer gameServer, HttpServer httpServer) {
+        super(gameServer, httpServer);
+
+        instance = this;
+    }
+
+    /**
+     * Gets the server hook instance.
+     *
+     * @return A {@link ServerHook} singleton.
+     */
+    public static ServerHook getInstance() {
+        return instance;
+    }
+}