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/policies/notificationSetting.ts

@@ -0,0 +1,16 @@
+import { NotificationSetting, Team, User } from "@server/models";
+import policy from "./policy";
+
+const { allow } = policy;
+
+allow(User, "createNotificationSetting", Team, (user, team) => {
+  if (!team || user.teamId !== team.id) return false;
+  return true;
+});
+
+allow(
+  User,
+  ["read", "update", "delete"],
+  NotificationSetting,
+  (user, setting) => user && user.id === setting.userId
+);