feat(PartialGroupDMChannel): to support Invite#channel for group dms (#3786)

* add PartialGroupDMChannel class

* fix lint

* add new errors

* add new class to Channel.create

* fix lint

* update typings accordingly

* better implement errors

* remove unnecessary functions

* oops

* lint

* lint

* lint

* more lint

* more lint

* jsdoc typo

* suggested changes

* i did not forget the typings

src/errors/Messages.js

@@ -94,6 +94,9 @@ const Messages = {
   REACTION_RESOLVE_USER: 'Couldn\'t resolve the user ID to remove from the reaction.',
 
   VANITY_URL: 'This guild does not have the VANITY_URL feature enabled.',
+
+  DELETE_GROUP_DM_CHANNEL: 'Bots don\'t have access to Group DM Channels and cannot delete them',
+  FETCH_GROUP_DM_CHANNEL: 'Bots don\'t have access to Group DM Channels and cannot fetch them',
 };
 
 for (const [name, message] of Object.entries(Messages)) register(name, message);