Allow filtering users with accepts_chat_messages capability

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

priv/repo/migrations/20230703215000_add_accepts_chat_messages_index_to_users.exs

@@ -0,0 +1,7 @@
+defmodule Pleroma.Repo.Migrations.AddAcceptsChatMessagesIndexToUsers do
+  use Ecto.Migration
+
+  def change do
+    create(index(:users, [:accepts_chat_messages]))
+  end
+end