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/Team.js

@@ -0,0 +1,109 @@
+'use strict';
+
+const Snowflake = require('../util/Snowflake');
+const Collection = require('../util/Collection');
+const Base = require('./Base');
+const TeamMember = require('./TeamMember');
+
+/**
+ * Represents a Client OAuth2 Application Team.
+ * @extends {Base}
+ */
+class Team extends Base {
+  constructor(client, data) {
+    super(client);
+    this._patch(data);
+  }
+
+  _patch(data) {
+    /**
+     * The ID of the Team
+     * @type {Snowflake}
+     */
+    this.id = data.id;
+
+    /**
+     * The name of the Team
+     * @type {string}
+     */
+    this.name = data.name;
+
+    /**
+     * The Team's icon hash
+     * @type {?string}
+     */
+    this.icon = data.icon || null;
+
+    /**
+     * The Team's owner id
+     * @type {?string}
+     */
+    this.ownerID = data.owner_user_id || null;
+
+    /**
+     * The Team's members
+     * @type {Collection<Snowflake, TeamMember>}
+     */
+    this.members = new Collection();
+
+    for (const memberData of data.members) {
+      const member = new TeamMember(this.client, this, memberData);
+      this.members.set(member.id, member);
+    }
+  }
+
+  /**
+   * The owner of this team
+   * @type {?TeamMember}
+   * @readonly
+   */
+  get owner() {
+    return this.members.get(this.ownerID) || null;
+  }
+
+  /**
+   * The timestamp the app was created at
+   * @type {number}
+   * @readonly
+   */
+  get createdTimestamp() {
+    return Snowflake.deconstruct(this.id).timestamp;
+  }
+
+  /**
+   * The time the app was created at
+   * @type {Date}
+   * @readonly
+   */
+  get createdAt() {
+    return new Date(this.createdTimestamp);
+  }
+
+  /**
+   * A link to the application's icon.
+   * @param {ImageURLOptions} [options={}] Options for the Image URL
+   * @returns {?string} URL to the icon
+   */
+  iconURL({ format, size } = {}) {
+    if (!this.icon) return null;
+    return this.client.rest.cdn.TeamIcon(this.id, this.icon, { format, size });
+  }
+
+  /**
+   * When concatenated with a string, this automatically returns the Team's name instead of the
+   * Team object.
+   * @returns {string}
+   * @example
+   * // Logs: Team name: My Team
+   * console.log(`Team name: ${team}`);
+   */
+  toString() {
+    return this.name;
+  }
+
+  toJSON() {
+    return super.toJSON({ createdTimestamp: true });
+  }
+}
+
+module.exports = Team;