feat: api v9 and threads (#5570)

Co-authored-by: Noel <icrawltogo@gmail.com>
Co-authored-by: Amish Shah <dev@shah.gg>
Co-authored-by: Vlad Frangu <kingdgrizzle@gmail.com>
Co-authored-by: SynthGhost <60333233+synthghost@users.noreply.github.com>
Co-authored-by: SpaceEEC <24881032+SpaceEEC@users.noreply.github.com>
Co-authored-by: Elliot <elliot@maisl.fr>
Co-authored-by: Antonio Román <kyradiscord@gmail.com>
Co-authored-by: Sugden <28943913+NotSugden@users.noreply.github.com>

src/structures/ThreadMember.js

@@ -0,0 +1,95 @@
+'use strict';
+
+const Base = require('./Base');
+const ThreadMemberFlags = require('../util/ThreadMemberFlags');
+
+/**
+ * Represents a Member for a Thread.
+ * @extends {Base}
+ */
+class ThreadMember extends Base {
+  /**
+   * @param {ThreadChannel} thread The thread that this member is associated with
+   * @param {Object} data The data for the thread member
+   */
+  constructor(thread, data) {
+    super(thread.client);
+
+    /**
+     * The thread that this member is a part of
+     * @type {ThreadChannel}
+     */
+    this.thread = thread;
+
+    /**
+     * The timestamp the member last joined the thread at
+     * @type {?number}
+     */
+    this.joinedTimestamp = null;
+
+    /**
+     * The id of the thread member
+     * @type {Snowflake}
+     */
+    this.id = data.user_id;
+
+    this._patch(data);
+  }
+
+  _patch(data) {
+    this.joinedTimestamp = new Date(data.join_timestamp).getTime();
+
+    /**
+     * The flags for this thread member
+     * @type {ThreadMemberFlags}
+     */
+    this.flags = new ThreadMemberFlags(data.flags).freeze();
+  }
+
+  /**
+   * The guild member that this thread member instance represents
+   * @type {?GuildMember}
+   * @readonly
+   */
+  get guildMember() {
+    return this.thread.guild.members.resolve(this.id);
+  }
+
+  /**
+   * The last time this member joined the thread
+   * @type {?Date}
+   * @readonly
+   */
+  get joinedAt() {
+    return this.joinedTimestamp ? new Date(this.joinedTimestamp) : null;
+  }
+
+  /**
+   * The user that this thread member instance represents
+   * @type {?User}
+   * @readonly
+   */
+  get user() {
+    return this.client.users.resolve(this.id);
+  }
+
+  /**
+   * Whether the client user can manage this thread member
+   * @type {boolean}
+   * @readonly
+   */
+  get manageable() {
+    return !this.thread.archived && this.thread.editable;
+  }
+
+  /**
+   * Remove this member from the thread.
+   * @param {string} [reason] Reason for removing the member
+   * @returns {ThreadMember}
+   */
+  remove(reason) {
+    return this.thread.members.remove(this.id, reason).then(() => this);
+  }
+}
+
+module.exports = ThreadMember;