feat(Managers): new ApplicationCommandPermissionsManager (#5897)

Co-authored-by: SpaceEEC <24881032+SpaceEEC@users.noreply.github.com>
Co-authored-by: Yoshida Tomio <mail@tomio.codes>
Co-authored-by: Antonio Román <kyradiscord@gmail.com>
Co-authored-by: Vlad Frangu <kingdgrizzle@gmail.com>

src/managers/GuildApplicationCommandManager.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const ApplicationCommandManager = require('./ApplicationCommandManager');
+const ApplicationCommandPermissionsManager = require('./ApplicationCommandPermissionsManager');
 
 /**
  * An extension for guild-specific application commands.
@@ -15,6 +16,12 @@ class GuildApplicationCommandManager extends ApplicationCommandManager {
      * @type {Guild}
      */
     this.guild = guild;
+
+    /**
+     * The manager for permissions of arbitrary commands on this guild
+     * @type {ApplicationCommandPermissionsManager}
+     */
+    this.permissions = new ApplicationCommandPermissionsManager(this);
   }
 }