Flags API (#9666)

* feat: new routes for flags API

+ flag get
+ flag creation, migration from socket method
+ flag update, migration from socket method
* fixed bug where you could not unassign someone from a flag

* feat: tests for new flags API

added missing files for schema update

* fix: flag tests to use Write API instead of sockets

* feat: flag notes API + tests

* chore: remove debug line

* test: fix breaking test on mongo

public/openapi/write.yaml

@@ -128,6 +128,14 @@ paths:
     $ref: 'write/posts/pid/diffs/since.yaml'
   /posts/{pid}/diffs/{timestamp}:
     $ref: 'write/posts/pid/diffs/timestamp.yaml'
+  /flags/:
+    $ref: 'write/flags.yaml'
+  /flags/{flagId}:
+    $ref: 'write/flags/flagId.yaml'
+  /flags/{flagId}/notes:
+    $ref: 'write/flags/flagId/notes.yaml'
+  /flags/{flagId}/notes/{datetime}:
+    $ref: 'write/flags/flagId/notes/datetime.yaml'
   /admin/settings/{setting}:
     $ref: 'write/admin/settings/setting.yaml'
   /admin/analytics/{set}: