std/node: make process global (#4985)

std/node/README.md

@@ -69,7 +69,7 @@ they are stable:
 ## CommonJS Module Loading
 
 `createRequire(...)` is provided to create a `require` function for loading CJS
-modules.
+modules. It also sets supported globals.
 
 ```ts
 import { createRequire } from "https://deno.land/std/node/module.ts";

std/node/process.ts

@@ -37,3 +37,10 @@ export const process = {
     return [Deno.execPath(), ...Deno.args];
   },
 };
+
+Object.defineProperty(globalThis, "process", {
+  value: process,
+  enumerable: false,
+  writable: true,
+  configurable: true,
+});