Expose commit hash from pyvw metadata

[ataymano]

Short description

Please expose git commit to pyvw version number if it is possible.
cmd:

vw --version
9.2.0 (git commit: 1be36baae)

python:

>>> vowpalwabbit.__version__
'9.1.0'

How this suggestion will help you/others

Consistent versioning across c++ and python is good in general. It will also help to improve vw_executor and support vw versioning there.

[jackgerrits]

I think that value is meant to stay a standard semver value. But there is nothing stopping us adding commit which exposes the commit

[lalo]

#3446

[ataymano]

#3446

Thank you!

[lalo]

Re-opening since that PR is just a breadcrumb from a previous approach we did.