base-stats,python: Expose a stat's unit via PyBind11
base-stats,python: Expose a stat's unit via PyBind11

Change-Id: I77df868a6bc92e5bb0a39592b5aca8e0d259bb05
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/41753
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>

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