node-compat: Allow process.env or import.meta.env

[birkskyum]

I'm trying to run an express app, and have to rewrite all process.env / import.meta.env to Deno.env.get()

Attaching the vars to process / import.meta would allow the app to run as is.

I get a ReferenceError: process is not defined when using the --env-file

There could also be exposure like Deno.env.ENV_VAR as an alternative to Deno.env.get("ENV_VAR") that is easier to do a find-replace for, than meticulously going through an app to add quotes and parenthesis.

[birkskyum]

Works fine now with the 2.0 rc.