feat(WelcomeScreen): welcome screens (#5490)

Co-authored-by: Jan <66554238+vaporox@users.noreply.github.com>
Co-authored-by: izexi <43889168+izexi@users.noreply.github.com>
Co-authored-by: SpaceEEC <spaceeec@yahoo.com>
Co-authored-by: Vlad Frangu <kingdgrizzle@gmail.com>

src/structures/WelcomeChannel.js

@@ -0,0 +1,60 @@
+'use strict';
+
+const Base = require('./Base');
+const Emoji = require('./Emoji');
+
+/**
+ * Represents a channel link in a guild's welcome screen.
+ * @extends {Base}
+ */
+class WelcomeChannel extends Base {
+  constructor(guild, data) {
+    super(guild.client);
+
+    /**
+     * The guild for this welcome channel
+     * @type {Guild|WelcomeGuild}
+     */
+    this.guild = guild;
+
+    /**
+     * The description of this welcome channel
+     * @type {string}
+     */
+    this.description = data.description;
+
+    /**
+     * The raw emoji data
+     * @type {Object}
+     * @private
+     */
+    this._emoji = {
+      name: data.emoji_name,
+      id: data.emoji_id,
+    };
+
+    /**
+     * The id of this welcome channel
+     * @type {Snowflake}
+     */
+    this.channelID = data.channel_id;
+  }
+
+  /**
+   * The channel of this welcome channel
+   * @type {?TextChannel|NewsChannel}
+   */
+  get channel() {
+    return this.client.channels.resolve(this.channelID);
+  }
+
+  /**
+   * The emoji of this welcome channel
+   * @type {GuildEmoji|Emoji}
+   */
+  get emoji() {
+    return this.client.emojis.resolve(this._emoji.id) ?? new Emoji(this.client, this._emoji);
+  }
+}
+
+module.exports = WelcomeChannel;