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

app/components/Avatar/index.ts

@@ -0,0 +1,6 @@
+import Avatar from "./Avatar";
+import AvatarWithPresence from "./AvatarWithPresence";
+
+export { AvatarWithPresence };
+
+export default Avatar;