Migrate CI to GitHub Actions

[guillaumekh]

Hi,

I understand there was interest from the maintainer in migrating CI to GitHub Actions.

Having some familiarity with GitHub Actions, and needing to get this package otherwise working with modern Python, I endeavored to give it a try.

It was more work than hoped for, and some more work is still needed to get this over the finish line.

Right now, a lot of tests are still failing but I lack the time to dig further, and am hamstrung by my near total lack of experience w/ Python.

Some notes:

• numpy@1.25.0 dropped support for Python <= 3.8
• numpy@1.20+ broke mir_eval.
  • A fix was merged in mir_eval main branch but has not been released yet.
  • As a — really really bad — crutch, I've changed the dependency on mir_eval main branch for the time being 🫠
  • As mentioned elsewhere here, a new mir_eval release is what we really need.
• matplotlib@3.9.0 brakes mir_eval.
  • Did I mention we need a new mir_eval release?
• i updated pytest hoping it would help solve failing tests but that's a HUGE v3—>v8 jump. I only made the bare minimum of fixes to accomodate this upgrade, and I would expect more work is needed.
• i wanted to add python 11/12 support but delayed this until we can already get tests runnning properly on 3.9/3.10

Would anyone be willing to try and pick things up where I left them?

[bmcfee]

Thanks for all the work on this! I'm a bit swamped over the next couple of weeks, but I'll try to pick this up.