feat(Rest): show the data that is sent to Discord when an errors occurs (#5701)

src/rest/DiscordAPIError.js

@@ -5,7 +5,7 @@
  * @extends Error
  */
 class DiscordAPIError extends Error {
-  constructor(path, error, method, status) {
+  constructor(error, status, request) {
     super();
     const flattened = this.constructor.flattenErrors(error.errors || error).join('\n');
     this.name = 'DiscordAPIError';
@@ -15,13 +15,13 @@ class DiscordAPIError extends Error {
      * The HTTP method used for the request
      * @type {string}
      */
-    this.method = method;
+    this.method = request.method;
 
     /**
      * The path of the request relative to the HTTP endpoint
      * @type {string}
      */
-    this.path = path;
+    this.path = request.path;
 
     /**
      * HTTP error code returned by Discord
@@ -34,6 +34,15 @@ class DiscordAPIError extends Error {
      * @type {number}
      */
     this.httpStatus = status;
+
+    /**
+     * The data associated with the request that caused this error
+     * @type {HTTPErrorData}
+     */
+    this.requestData = {
+      json: request.options.data,
+      files: request.options.files ?? [],
+    };
   }
 
   /**