Update build system to conan2

[mdavezac]

No description provided.

[jasonmcewen]

Hey @mdavezac, hope all is good with you!

What state is Conan 2 support in? Could this be merged?

We're actively developing a number of relatively new codes (s2fft, s2wav, s2scat) that use some ssht features and also regression test against it. For that reason it would be very useful to update ssht to support numpy 2 and also Conan 2. It would also be good to do the same for so3 and s2let.

Conan 2 support appears to be a blocker for getting some of these codes going on some large clusters (e.g. NERSC), as discussed in this issue.

We can help get this going if you could point us in the right direction?

Pinging @CosmoMatt and @matt-graham to keep them in the loop.

[mdavezac]

mmm, dropped the ball on that one. I'll try and refresh my memory over the weekend.

[mdavezac]

Actually, it looks like the recipe in conan-center is up to date.
You can try it with conan search ssht and conan install --requires "ssht/1.5.2" --build=missing.
From other projects, it can be installed like any other conan package.