refactor: deprecate v13 properties and methods (#7782)

* refactor: deprecate splitting

* refactor: deprecate `IntegrationApplication#summary`

https://github.com/discordjs/discord.js/pull/7729

* docs: amend store channel wording

* refactor: deprecate fetching of application assets

* docs: deprecate vip field in voice regions

src/structures/IntegrationApplication.js

@@ -54,6 +54,7 @@ class IntegrationApplication extends Application {
       /**
        * The application's summary
        * @type {?string}
+       * @deprecated This property is no longer being sent by the API.
        */
       this.summary = data.summary;
     } else {