*Add app getter method to api

src/modules/app.ts

@@ -19,3 +19,7 @@ export async function start() {
 
   await app.listen({ port: config.uint("core.appport"), host: "0.0.0.0" });
 }
+
+export function get(): FastifyInstance {
+  return app;
+}

src/modules/plugin.ts

@@ -17,6 +17,7 @@ import {
   ProtocolManager,
 } from "./swarm.js";
 import { get as getSSl, SSLManager } from "./ssl.js";
+import { get as getApp } from "./app.js";
 import type { HDKey } from "micro-ed25519-hdkey";
 import corePlugins from "../plugins";
 import Util from "./plugin/util";
@@ -95,6 +96,10 @@ class PluginAPI extends EventEmitter2 {
     return getProtocolManager();
   }
 
+  get app() {
+    return getApp();
+  }
+
   public loadPlugin(
     moduleName: string
   ): (moduleName: string) => Promise<Plugin> {