[Feature request] Fetch patch(es) from url

Hey @ds300

Thanks for creating and maintaining `patch-package`, it has made my life much easier 👍

### The Problem

I often find myself copy pasting patches from a codebase to another. While not a huge issue, it would be nice to avoid it.

### Possible Solution

Instead of specifying the package name or git commit the user would provide a url pointing to where the patch is located.

`patch-package` would detect that it's a url, download the patches locally and then work as it does normally.

Is this something you would be interested to add ? Happy to take a shot at a PR if you are !

Cheers

Commencez par examiner comment patch-package accepte actuellement les noms de paquets ou les commits git, et comment il télécharge et applique les patches. Définissez l’entrée URL attendue, le comportement du téléchargement et les critères d’achèvement, puis ajoutez des tests couvrant la récupération de patches depuis une URL en complément des flux existants.

Rédigé par le modèle d'indexation à partir du texte de l'issue.