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/models/CollectionGroupMembership.ts

@@ -0,0 +1,24 @@
+import { computed } from "mobx";
+import BaseModel from "./BaseModel";
+
+class CollectionGroupMembership extends BaseModel {
+  id: string;
+
+  groupId: string;
+
+  collectionId: string;
+
+  permission: string;
+
+  @computed
+  get isEditor(): boolean {
+    return this.permission === "read_write";
+  }
+
+  @computed
+  get isMaintainer(): boolean {
+    return this.permission === "maintainer";
+  }
+}
+
+export default CollectionGroupMembership;