[FEAT] Show SI values for data units read/written alongside 512byte units

[anirudhgray]

Is your feature request related to a problem? Please describe.
Currently the "Data Units Read/Written" section for NVME attributes gives the value in "number of 512 byte data units... in thousands". This isn't the most immediately useful format for this value.

Describe the solution you'd like
These values should also be given in GB/TB (eg, for the screenshot below, 110GB read and 165GB written). This could be given inside brackets, or in a popover.

Additional context