Merge refactored Plantonic Solid module

[yingyue2030699]

• refactored the platonic solid module to a clear structure of a subpackage + two files
• fixed the wrong geometry (e.g. the tetrahedron geometry was wrong)
• removed redundant API from the ionerdss init
• fixed associated unittests

Tasks to consider:

• Integration tests for platonic solid modules
• Remove "round to n" from all the subpackages for platonic solid modules
• Move integration test .cifs to dedicated folder under unittest and avoid fetching them (currently failing in github actions)