Forward cookie from request

[Jean-Beru]

Add a forwardCookie(string $name) that would fetch a cookie from the request and send it to Gotenberg.

It could be useful to authenticate Gotenberg when it tries to access to an URL.

Originally posted by @Neirda24 in #33 (comment)

[Neirda24]

I'd go even further. A ->forwardAuthenticatedUser() + ->asUser(UserInterface $user) WDYT ?

[Jean-Beru]

->forwardAuthenticatedUser() => ->forwardAuthentication() ?

Is ->asUser(UserInterface $user) needed ? I an user doesn't have access to a resource, it may not be allowed to generate the same resource in PDF.

[Neirda24]

If you generate from a CLI you'll need this.

[Jean-Beru]

If you generate from a CLI you'll need this.

Indeed