Modernize package and support latest python

[ikrommyd]

Full package modernization and support for latest python

[ikrommyd]

@henryiii could you take a look here please? I used your skills

[henryiii]

I checked over the configuration and CI changes, all looks good. Also ran Astra, didn't see any issues.

[ikrommyd]

@HDembinski if you wanna take a look here and run ci too, we can then move the package to scikit-hep.

[HDembinski]

@ikrommyd I invited you as collaborator for this repo to smooth things.

[ikrommyd]

@ikrommyd I invited you as collaborator for this repo to smooth things.

Thanks! Looks like the CI is passing so this should be ready for review.