refactor: adjust node middleware handling to share common handling with edge middleware

Author: pieh

edge-runtime/shim/index.js renamed to edge-runtime/shim/edge.js

@@ -0,0 +1,16 @@
+// NOTE: This is a fragment of a JavaScript program that will be inlined with
+// a Webpack bundle. You should not import this file from anywhere in the
+// application.
+import { AsyncLocalStorage } from 'node:async_hooks'
+
+import { createRequire } from 'node:module' // used in dynamically generated part
+import process from 'node:process'
+
+import { registerCJSModules } from '../edge-runtime/lib/cjs.ts' // used in dynamically generated part
+
+globalThis.process = process
+
+globalThis.AsyncLocalStorage = AsyncLocalStorage
+
+// needed for path.relative and path.resolve to work
+Deno.cwd = () => ''