[ENG-765] Reported Total capacity and Free space are wrong (#1066)

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* Attempt at fixing stats

* Fix macOS disk stats retrieve logic
 - Ignore mounted dmgs when calculation disk total/free size
 - Only take into account disk mounted by macOS

* macos only import

* Fix Linux

* Replace byte-size with a custom implementation that supports BigInt

* Fix NaN in Statistics

* clippy

* fmt

* Move linux get_volumes to a specilized function
 - Fix ZFS handling
 - Improve handling of disk symlinks and multiple mounts

* Fix macOS

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