refactor: clean up rate limit handling (#2694)

* refactor: clean up rate limit handling

* requested changes

* remove request mode option

* fix dupe requests

* hardcode reaction ratelimits

* suggested changes

* fix small thing

* re-add restTimeOffset

* move restTimeOffset a bit

* i swear i know english its my native language ok

* requested changes

* fix: a bit *too* pre-emptive with ratelimits, now less so

* fix: dapi error shoudl reject with path

* fix: make errors in execute catchable

* fix promise return

* rebase is hard

src/rest/HTTPError.js

@@ -0,0 +1,31 @@
+class HTTPError extends Error {
+  constructor(message, name, code, method, path) {
+    super(message);
+
+    /**
+     * The name of the error
+     * @type {string}
+     */
+    this.name = name;
+
+    /**
+     * HTTP error code returned from the request
+     * @type {number}
+     */
+    this.code = code || 500;
+
+    /**
+     * The HTTP method used for the request
+     * @type {string}
+     */
+    this.method = method;
+
+    /**
+     * The path of the request relative to the HTTP endpoint
+     * @type {string}
+     */
+    this.path = path;
+  }
+}
+
+module.exports = HTTPError;