chore: add xmake ci

[qudix]

I had to comment out two includes (stdfloat and print) due to CI not using a newer version of the toolset (14.37) which includes these features.
https://en.cppreference.com/w/cpp/compiler_support/23

[FlayaN]

Not sure the issue is that the CI runners are missing the 14.37 toolset, it's that it's installed with 4 different toolset and in some cases it "picks" the wrong one.

For me using cmake I couldn't get it to build using msvc generator on the gh-workflow (It always picked the 14.35 instead of 14.37..), only worked using ninja generator.. Just if you wanted to look into it a bit more instead of commenting out the newest headers.

[qudix]

I can force it to choose 14.37, but then it will always use that. Commenting these two includes is the easiest since nothing in CLib uses the vast majority of the includes in PCH, including these two. I'm not even sure why they're all there.