console: split console into global.js and constructor.js

Since we do not actually use the Console constructor to
instantiate the global console, move the two piece of
code into two different JS files for clarity, and make
console.js a mere re-export of the global console.
The hope is to make the global console, a namespace, more
web-compatible while keeping the Console constructor
available for backwards compatibility.

PR-URL: https://github.com/nodejs/node/pull/24709


Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>