Multiparticle data library generator script

[ilhamv]

We should add a script to the top folder (data_library_generation) so that users can prepare multiple datasets (nuclides and elements) or a dataset for multiple particles (e.g., electron and photon in the same file). What are your thoughts on this?

Originally posted by @melekderman in #400 (comment)

[ilhamv]

cc: @ethan-lame