refactor: removed code and split options (#5918)

Co-authored-by: Jan <66554238+vaporox@users.noreply.github.com>

BREAKING CHANGE: Removed `APIMessage#split`
BREAKING CHANGE: Removed `MessageEditOptions#code`
BREAKING CHANGE: Removed `BaseMessageOptions#code`
BREAKING CHANGE: Removed `BaseMessageOptions#split`

src/util/Util.js

@@ -55,6 +55,16 @@ class Util {
     return out;
   }
 
+  /**
+   * Options for splitting a message.
+   * @typedef {Object} SplitOptions
+   * @property {number} [maxLength=2000] Maximum character length per message piece
+   * @property {string|string[]|RegExp|RegExp[]} [char='\n'] Character(s) or Regex(s) to split the message with,
+   * an array can be used to split multiple times
+   * @property {string} [prepend=''] Text to prepend to every piece except the first
+   * @property {string} [append=''] Text to append to every piece except the last
+   */
+
   /**
    * Splits a string into multiple chunks at a designated character that do not exceed a specific length.
    * @param {string} text Content to split