Switch to ruff and port to mesonpy

[alexfikl]

This does a bit of modernizing as the title says.

The examples are pretty out of date, but the rest of the things seems to be working.

[alexfikl]

I've looked around a bit and think I know why the wheel build failures are happening.
https://github.com/inducer/meshpy/actions/runs/9821375911

1. On Windows, it seems like it's a 32-bit vs 64-bit issue: trying to build a 32 bit extension
   with a 64 bit compiler. Numpy had the same problem BLD: win32 not using python architecture  numpy/numpy#24704.

2. On Ubuntu, it's an issue with the available numpy wheels. They don't have wheels for pypy38, pypy310 and some i686 combinations in there. That makes the CI try to build numpy from scratch and (besides taking a long time) it eventually fails on PyPy 3.9 manylinux i686.

EDIT: I've added additional skips pp*-manylinux_i686 *-win32. Let me know if you want to support any of those.

[inducer]

You're trying to make sure that I have to know all the build tools. I appreciate the sentiment. 🤦 😁

[alexfikl]

Haha, sorry about that! I was just being lazy and started copying from pyfmmlib :(

I also thought that they used a different editable machinery that allowed pylint to work.. but apparently not :\

[inducer]

EDIT: I've added additional skips pp*-manylinux_i686 *-win32. Let me know if you want to support any of those.

Nah. (But thanks for asking.) My logic is mostly, support $\Leftrightarrow$ (mainstream $\lor$ easy).

[inducer]

Didn't see anything objectionable, so 🚀 let's do it.

[inducer]

Thanks!