Allow node.js compat on Cloudflare

Cloudflare provides some Node.js modules through node: prefix according to https://developers.cloudflare.com/workers/runtime-apis/nodejs/
Without listing prefix as external bundler cannot resolve libraries and fails. This change allows usage of node: imports similarly to cloudflare: prefixed imports.

packages/adapter-cloudflare/index.js

@@ -58,7 +58,7 @@ export default function (options = {}) {
 				loader: {
 					'.wasm': 'copy'
 				},
-				external: ['cloudflare:*']
+				external: ['cloudflare:*', 'node:*']
 			});
 		}
 	};