Add a new example for using scipy with the Python module

[jabraham17]

Adds a new example for using scipy with the Python module.

This is arguably a test only change, although the test folder is listed in the documentation.

• start_test test/library/packages/Python/examples/scipy/ with/without gasnet

[Reviewed by @]

[jabraham17]

I had a brainwave on this. I had been blaming many of the problems on Chapel's first-class function support. And while its partly at fault, its totally possible to make this work without better first-class function support.

You can see the difference in ef50bc6. The code was passing a FCP, getting a pointer to it, and trying to use that. But that's not really valid, because we end up getting a pointer to a local variable, and then returning that pointer out of scope. The simple fix is to hoist the creation of the pointer, so we call c_ptrTo on the original Chapel proc, not the local FCP.

[jabraham17]

Unfortunately, I am still going to have to leave this unmerged

I tested with the following, and got various forms of pass/fail

• Works
  • fedora 42 on x86 with Chapel 2.5
  • ubuntu 24 on x86 with main
• Fails
  • mac on arm with Chapel 2.5
  • mac on arm with main
  • SLES 15 on x86 with main

I can't explain this, but since almost all of our testing is on SLES merging this would break nightly, even though I can confirm it works on other OSes