resolves #50 : modernize cmake and ci

[prudhomm]

• closes #50
• update CI to reflect github runners environment (use -latest environment)

[prudhomm]

@bab2min here is the CI on my side: https://github.com/feelpp/EigenRand/actions so far so good, almost done

[bab2min]

@prudhomm Wow~ amazing PR including full testing! Thank you for your contribution. It looks good to me. I'll merge it!