feat: Collection admins (#5273

* Split permissions for reading documents from updating collection

* fix: Admins should have collection read permission, tests

* tsc

* Add admin option to permission selector

* Combine publish and create permissions, update -> createDocuments where appropriate

* Plural -> singular

* wip

* Quick version of collection structure loading, will revisit

* Remove documentIds method

* stash

* fixing tests to account for admin creation

* Add self-hosted migration

* fix: Allow groups to have admin permission

* Prefetch collection documents

* fix: Document explorer (move/publish) not working with async documents

* fix: Cannot re-parent document to collection by drag and drop

* fix: Cannot drag to import into collection item without admin permission

* Remove unused isEditor getter

app/components/Sidebar/components/useCollectionDocuments.ts

@@ -8,8 +8,8 @@ export default function useCollectionDocuments(
   activeDocument: Document | undefined
 ) {
   return React.useMemo(() => {
-    if (!collection) {
-      return [];
+    if (!collection?.sortedDocuments) {
+      return undefined;
     }
 
     const insertDraftDocument =