[WIP] CMake: Tarball Support

[ax3l]

This speeds up the configure step from 20.1sec to 6.5sec by just downloading a shallow copy of AMReX & pybind11.

• check AMReX version output during configure and ensure build version logic in AMReX is still sensible (e.g., output during AMReX initialize)
• add a script to simply update tar sha and git branch at the same time for AMReX & pybind11 updates.

[ax3l]

@EZoni @WeiqunZhang this PR is not urgent and I can take it on when I am back from parental leave. I want to introduce it consistently in pyAMReX/WarpX/ImpactX/HiPACE during the same release cycle. Can wait for 2025.

I already use the same trick in openPMD-api 0.16.0+
As an alternative approach, one could do shallow (--depth 1) git clones, but unfortunately, the CMake git fetcher does not support shallow copies.