Support leases for File Shares

[MRayermannMSFT]

File Shares let you lease files. We could support acquiring and breaking such leases:

https://docs.microsoft.com/en-us/rest/api/storageservices/lease-file

However, file share file leases are different than blob leases in that they are not returned when listing. Instead they are viewable only when getting file properties. Thus, we cannot easily show lease status in the file explorer data grid. We'd likely need to do something like portal that opens up a different control (note that portal doesn't allow creating/breaking leases in this control, just viewing): Given the scope of this work and lack of user interest, this is currently deprioritized.