refactor: Expand schema (#7772)

* packedNotificationSchemaを更新

* read:gallery, write:gallery, read:gallery-likes, write:gallery-likesに翻訳を追加

* fix

* add header, choice, invitation

* test

* fix

* yatta

* remove no longer needed "as PackedUser/PackedNote"

* clean up

* add simple-schema

* fix lint

* define items in full Schema

* revert https://github.com/misskey-dev/misskey/pull/7772#discussion_r706627736

* user packとnote packの型不整合を修正