[12.x] Add Http::requestException()

[cosmastech]

I had a need earlier to throw a RequestException for an exception throwing stub class.

It wasn't super obvious how to do it; I ended up with something like:

Before

$exception = new RequestException(
    new Response(
        Http::response(['code' => 'not_found', 404)->wait()
    )
);

While this is fine, I thought maybe a helper (to go along with the failedConnection() method) would be appreciated by others.

After

$exception = Http::requestException(['code' => 'not_found'], 404);

[github-actions]

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