Build numpy from src in integration test

[ryanking13]

Build numpy using pyodide build command in the integration test.

[agriyakhetarpal]

Thanks, @ryanking13! NumPy builds with Meson, so this is nice to see. Could we also add one more Scientific Python project, say, one that relies on a different build backend such as scikit-build-core? We are not constrained by the number of CI jobs, and there would be scope for parallelising them.

[agriyakhetarpal]

Maybe we can make this a Python file instead of a shell script (it would help in the case we establish Windows support someday, now that Emscripten is generally available through Windows package managers)?

[hoodmane]

We are never establishing windows support. People on Windows can use windows subsystem linux.

[agriyakhetarpal]

I see, no worries! There is a chance things might work for anyone trying it out with minimal changes (except for the shell scripts, I guess), so if someone wants, they can do those changes themselves.

[ryanking13]

I updated the target to Numpy v2.0.2. I'll go ahead and merge this PR. Lets add more test cases in the follow-up PRs.