refactor: Use ESM (#8358)

* wip

* wip

* fix

* clean up

* Update tsconfig.json

* Update activitypub.ts

* wip

packages/backend/src/mfm/from-html.ts

@@ -1,6 +1,6 @@
 import * as parse5 from 'parse5';
-import treeAdapter = require('parse5/lib/tree-adapters/default');
-import { URL } from 'url';
+import treeAdapter from 'parse5/lib/tree-adapters/default.js';
+import { URL } from 'node:url';
 
 const urlRegex     = /^https?:\/\/[\w\/:%#@$&?!()\[\]~.,=+\-]+/;
 const urlRegexFull = /^https?:\/\/[\w\/:%#@$&?!()\[\]~.,=+\-]+$/;