Add support for reading exFAT usage and updating the UUID

exfatprogs 1.1.0 released 2021-02-09 has gained support for:

1. reporting file system usage
   • [feature request] File system usage reporting #139
   • commit: exfatprogs: add dump.exfat
2. setting the Volume Serial Number (aka UUID)
   • [tools][feature request] Allow To Change Volume Serial Number ("ID") #138
   • commit: exfatlabel:add get/set volume serial option

so add these capabilities to GParted.