Version of solver in Python interface

[ThomSerg]

For CPMpy's interface to pumpkin-solver-py, we'd like to report the version of the backend solver in use. We can get the version of the python wrapper, which is synced to the pumpkin-solver-py rust package (through dynamic = ["version"] in the package.toml).
E.g.

try:
    return pkg_resources.get_distribution('pumpkin-solver-py').version 
except pkg_resources.DistributionNotFound:
    return None

Would it be possible to also expose the version of the actual solver package pumpkin-solver?

[maartenflippo]

@ThomSerg thank you for pointing this out. It would indeed be helpful if this could be accessed through the Python interface. Due to summer vacation, we likely will get around to this in September (unless @ImkoMarijnissen wants to have a go at this). When we do that, this issue should be automatically updated/closed.