[#246] Building .deb, .rpm and .tar.gz packages from the lib

[angeloprobst]

Closes #246

• Separate the hyperon_das_atomdb_cpp library building process from the nanobind building process.
• Add scripts to build .deb, .rpm and .tar.gz packages from the lib.
• Make the nanobind building process use the pre-built hyperon_das_atomdb_cpp library packages instead of compiling the lib code again.
• Reorganize the repo:
  • hyperon_das_atomdb_cpp sub-dir renamed to just cpp.
  • library code moved to lib sub-dir.
  • nanobind code moved to nanobind sub-dir.
  • packages are now dumped into lib/dist (for the C++ library, with RPM, DEB and TGZ releases) and nanobind/dist (for wheel files).
  • version attribute in nanobind/pyproject.toml applies on everything, on either wheel files and RPM/DEB/TGZ packages.
  • commands in the root Makefile changed a bit.