binding roaring64 to cpp version

[yihuang]

Open issues:

• can't set -std=c++20 to c++ complication only, so I changed it to link to external lib.
• need more apis, currently just a prototype.

[Ezibenroc]

Hello and thank you for this work! I will try to find some time and have a look this week.

[yihuang]

Ah, sorry, I didn't figure out how to make it build, so I implement the 64bit logic in pure python, wrapping pyroaring.BitMap as internal containers: https://github.com/yihuang/python-roaring64, which works well for my use case, I don't need extreme performance.
I'll closing this PR for now, feel free to cheery-pick if find it useful.