feature: teams support (#3350)

* basic teams support

* export Team & TeamMember

* use typedef

* typings and some fixes

* Update src/structures/TeamMember.js

Co-Authored-By: Vlad Frangu <kingdgrizzle@gmail.com>

* fix Team#iconURL()

* fix typings and a bug

* fix states start at 1

* team icon hash can be null

* fix owner typings

src/structures/ClientApplication.js

@@ -3,6 +3,7 @@
 const Snowflake = require('../util/Snowflake');
 const { ClientApplicationAssetTypes, Endpoints } = require('../util/Constants');
 const Base = require('./Base');
+const Team = require('./Team');
 
 const AssetTypes = Object.keys(ClientApplicationAssetTypes);
 
@@ -67,9 +68,9 @@ class ClientApplication extends Base {
 
     /**
      * The owner of this OAuth application
-     * @type {?User}
+     * @type {User|Team}
      */
-    this.owner = data.owner ? this.client.users.add(data.owner) : null;
+    this.owner = data.team ? new Team(this.client, data.team) : this.client.users.add(data.owner);
   }
 
   /**