refactor: deprecate v13 properties and methods (#7782)

* refactor: deprecate splitting

* refactor: deprecate `IntegrationApplication#summary`

https://github.com/discordjs/discord.js/pull/7729

* docs: amend store channel wording

* refactor: deprecate fetching of application assets

* docs: deprecate vip field in voice regions

src/util/Util.js

@@ -10,6 +10,7 @@ const { Error: DiscordError, RangeError, TypeError } = require('../errors');
 const has = (o, k) => Object.prototype.hasOwnProperty.call(o, k);
 const isObject = d => typeof d === 'object' && d !== null;
 
+let deprecationEmittedForSplitMessage = false;
 let deprecationEmittedForRemoveMentions = false;
 
 /**
@@ -70,9 +71,19 @@ class Util extends null {
    * Splits a string into multiple chunks at a designated character that do not exceed a specific length.
    * @param {string} text Content to split
    * @param {SplitOptions} [options] Options controlling the behavior of the split
+   * @deprecated This will be removed in the next major version.
    * @returns {string[]}
    */
   static splitMessage(text, { maxLength = 2_000, char = '\n', prepend = '', append = '' } = {}) {
+    if (!deprecationEmittedForSplitMessage) {
+      process.emitWarning(
+        'The Util.splitMessage method is deprecated and will be removed in the next major version.',
+        'DeprecationWarning',
+      );
+
+      deprecationEmittedForSplitMessage = true;
+    }
+
     text = Util.verifyString(text);
     if (text.length <= maxLength) return [text];
     let splitText = [text];