Create symlink via azure.storage.file FileService

### Which service(blob, file, queue) does this issue concern?
Note: for package version >= 12.0.0 please post the issue here instead: https://github.com/Azure/azure-sdk-for-python/issues
for table service, please post the issue here instead: https://github.com/Azure/azure-cosmosdb-python.
azure.storage.file

### Which version of the SDK was used? Please provide the output of `pip freeze`.
azure-storage-file==2.1.0

### What problem was encountered?
I'm trying to figure out how to create a symlink via the azure-storage-file FileService interface. Ideally, the symlink target doesn't need to exist, but I can work around that if need be. To be clear, I want the symlink uploaded, not the content of the symlink'ed file.

I should also clarify I am talking about a soft symlink here.

### Have you found a mitigation/solution?
No, I haven't been able to find a good example of how to accomplish this.

Commencez par l’interface FileService de azure.storage.file et la documentation de l’API azure-storage-file 2.1.0, en vous concentrant sur la manière dont les téléversements de fichiers représentent les liens symboliques. Déterminez si les objets de liens symboliques sont pris en charge indépendamment de leurs cibles et quel comportement de l’API définirait l’achèvement ; l’issue ne nomme aucun fichier source ni test.

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