chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

server/utils/parseAttachmentIds.ts

@@ -0,0 +1,7 @@
+const attachmentRegex = /\/api\/attachments\.redirect\?id=(?<id>[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})/gi;
+
+export default function parseAttachmentIds(text: any): string[] {
+  return [...text.matchAll(attachmentRegex)].map(
+    (match) => match.groups && match.groups.id
+  );
+}