Change how changes to media attachments are stored for edits (#17696)

* Change how changes to media attachments are stored for edits

Fix not being able to re-order media attachments

* Fix not broadcasting updates when polls/media is changed through ActivityPub

* Various fixes and improvements

* Update app/models/report.rb

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

* Add tracking of media attachment description changes

* Change poll in status edit to have a structure closer to the real one

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

db/migrate/20220302232632_add_ordered_media_attachment_ids_to_statuses.rb

@@ -0,0 +1,5 @@
+class AddOrderedMediaAttachmentIdsToStatuses < ActiveRecord::Migration[6.1]
+  def change
+    add_column :statuses, :ordered_media_attachment_ids, :bigint, array: true
+  end
+end

db/migrate/20220303000827_add_ordered_media_attachment_ids_to_status_edits.rb

@@ -0,0 +1,8 @@
+class AddOrderedMediaAttachmentIdsToStatusEdits < ActiveRecord::Migration[6.1]
+  def change
+    add_column :status_edits, :ordered_media_attachment_ids, :bigint, array: true
+    add_column :status_edits, :media_descriptions, :text, array: true
+    add_column :status_edits, :poll_options, :string, array: true
+    add_column :status_edits, :sensitive, :boolean
+  end
+end