This commit deprecates window global and adds deprecation
notice on each use of window.

We decided to proceed with removal of window global variable in Deno 2.0. There's a lot of code
in the wild that uses pattern like this:

if (typeof window !== "undefined) {
  ...
}

to check if the code is being run in browser. However, this check passes fine in Deno and
most often libraries that do this check try to access some browser API that is not available
in Deno, or use DOM APIs (which are also not available in Deno).

This situation has occurred multiple times already
and it's unfeasible to expect the whole ecosystem to migrate to new check (and even if that
happened there's a ton of code that's already shipped and won't change).

The migration is straightfoward - replace all usages of window with globalThis or self.
When Deno encounters use of window global it will now issue a warning, steering users
towards required changes:

Warning
├ Use of deprecated "window" API.
│
├ This API will be removed in Deno 2.0. Make sure to upgrade to a stable API before then.
│
├ Suggestion: Use `globalThis` or `self` instead.
│
├ Suggestion: You can provide `window` in the current scope with: `const window = globalThis`.
│
└ Stack trace:
  └─ at file:///Users/ib/dev/deno/foo.js:7:1

Ref #13367.