feat: Memberships (#1032)

* WIP

* feat: Add collection.memberships endpoint

* feat: Add ability to filter collection.memberships with query

* WIP

* Merge stashed work

* feat: Add ability to filter memberships by permission

* continued refactoring

* paginated list component

* Collection member management

* fix: Incorrect policy data sent down after collection.update

* Reduce duplication, add empty state

* cleanup

* fix: Modal close should be a real button

* fix: Allow opening edit from modal

* fix: remove unused methods

* test: fix

* Passing test suite

* Refactor

* fix: Flow UI errors

* test: Add collections.update tests

* lint

* test: moar tests

* fix: Missing scopes, more missing tests

* fix: Handle collection privacy change over socket

* fix: More membership scopes

* fix: view endpoint permissions

* fix: respond to privacy change on socket event

* policy driven menus

* fix: share endpoint policies

* chore: Use policies to drive documents UI

* alignment

* fix: Header height

* fix: Correct behavior when collection becomes private

* fix: Header height for read-only collection

* send id's over socket instead of serialized objects

* fix: Remote policy change

* fix: reduce collection fetching

* More websocket efficiencies

* fix: Document collection pinning

* fix: Restored ability to edit drafts
fix: Removed ability to star drafts

* fix: Require write permissions to pin doc to collection

* fix: Header title overlaying document actions at small screen sizes

* fix: Jank on load caused by previous commit

* fix: Double collection fetch post-publish

* fix: Hide publish button if draft is in no longer accessible collection

* fix: Always allow deleting drafts
fix: Improved handling of deleted documents

* feat: Show collections in drafts view
feat: Show more obvious 'draft' badge on documents

* fix: incorrect policies after publish to private collection

* fix: Duplicating a draft publishes it

server/models/User.js

@@ -51,6 +51,11 @@ User.associate = models => {
   });
   User.hasMany(models.Document, { as: 'documents' });
   User.hasMany(models.View, { as: 'views' });
+  User.belongsToMany(models.User, {
+    as: 'users',
+    through: 'collection_users',
+    onDelete: 'cascade',
+  });
 };
 
 // Instance methods
@@ -61,7 +66,6 @@ User.prototype.collectionIds = async function(paranoid: boolean = true) {
     include: [
       {
         model: User,
-        through: 'collection_users',
         as: 'users',
         where: { id: this.id },
         required: false,