Add RestUpload::with($headers) and RestUpload::including($cookies)

[thekid]

Consisten with RestRequest::with($headers) and RestRequest::inluding($cookies).

use io\File;
use webservices\rest\Endpoint;

$file= new File($reference);

$endpoint= new Endpoint('https://api.example.com/v1');
$response= $endpoint->resource('images/edits')
  ->upload(method: 'POST')
  ->with(['X-Request-ID' => $requestId])
  ->including(['session_id' => $sessionId])
  ->transfer('images[]', $file->in(), $file->filename)
  ->pass('prompt', 'This image but all people are Simpsons characters')
  ->finish()
;