refactor(rest): switch api to fetch-like and provide strategies (#9416)

BREAKING CHANGE: NodeJS v18+ is required when using node due to the use of global `fetch`
BREAKING CHANGE: The raw method of REST now returns a web compatible `Respone` object.
BREAKING CHANGE: The `parseResponse` utility method has been updated to operate on a web compatible `Response` object.
BREAKING CHANGE: Many underlying internals have changed, some of which were exported.
BREAKING CHANGE: `DefaultRestOptions` used to contain a default `agent`, which is now set to `null` instead.

packages/rest/src/lib/interfaces/Handler.ts

@@ -0,0 +1,28 @@
+import type { RequestInit } from 'undici';
+import type { ResponseLike } from '../REST.js';
+import type { HandlerRequestData, RouteData } from '../RequestManager.js';
+
+export interface IHandler {
+	/**
+	 * The unique id of the handler
+	 */
+	readonly id: string;
+	/**
+	 * If the bucket is currently inactive (no pending requests)
+	 */
+	get inactive(): boolean;
+	/**
+	 * Queues a request to be sent
+	 *
+	 * @param routeId - The generalized api route with literal ids for major parameters
+	 * @param url - The url to do the request on
+	 * @param options - All the information needed to make a request
+	 * @param requestData - Extra data from the user's request needed for errors and additional processing
+	 */
+	queueRequest(
+		routeId: RouteData,
+		url: string,
+		options: RequestInit,
+		requestData: HandlerRequestData,
+	): Promise<ResponseLike>;
+}