feat(GuildChannelManager): add addFollower (#9050)

* feat: addFolower method

* Update src/structures/NewsChannel.js

Co-authored-by: Jiralite <33201955+Jiralite@users.noreply.github.com>

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Co-authored-by: Jiralite <33201955+Jiralite@users.noreply.github.com>

src/structures/NewsChannel.js

@@ -10,6 +10,7 @@ const { Error } = require('../errors');
 class NewsChannel extends BaseGuildTextChannel {
   /**
    * Adds the target to this channel's followers.
+   * <info>If you need the created webhook id, use {@link GuildChannelManager#addFollower}.</info>
    * @param {TextChannelResolvable} channel The channel where the webhook should be created
    * @param {string} [reason] Reason for creating the webhook
    * @returns {Promise<NewsChannel>}