adds cloudflare cf object to platform property

this has been done for the pages package but not for workers.
see #9978

Author: Philipp Viereck

.changeset/cuddly-pigs-teach.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-cloudflare-workers': minor
+---
+
+feat: add cloudflare's `request.cf` object to the `event.platform` property

packages/adapter-cloudflare-workers/ambient.d.ts

@@ -1,4 +1,4 @@
-import { CacheStorage } from '@cloudflare/workers-types';
+import { CacheStorage, IncomingRequestCfProperties } from '@cloudflare/workers-types';
 
 declare global {
 	namespace App {
@@ -7,6 +7,7 @@ declare global {
 				waitUntil(promise: Promise<any>): void;
 			};
 			caches: CacheStorage;
+			cf?: IncomingRequestCfProperties;
 		}
 	}
 }

packages/adapter-cloudflare-workers/files/entry.js

@@ -71,7 +71,9 @@ export default {
 				env,
 				context,
 				// @ts-expect-error lib.dom is interfering with workers-types
-				caches
+				caches,
+				// @ts-expect-error req is actually a Cloudflare request not a standard request
+				cf: req.cf
 			},
 			getClientAddress() {
 				return req.headers.get('cf-connecting-ip');