Modern packaging + ruff + numpy 2 compat

[raphaelvallat]

This PR implements the following changes:

• Switch to modern packaging: everything is defined in the pyproject.toml. Source files are moved to the src/yasa/ folder, while tests are now in the tests folder at the root directory
• Switch to using Ruff instead of Black + Flake8
• Ensure compatibility with numpy >2.x

[remrama]

Sweet! Thanks @raphaelvallat, I was planning to include this in next release as well. I'll check it on my end in the next hour with a review.

[remrama]

@raphaelvallat sorry I know this is still WIP and you didn't request this, but I just glossed it over and here are small/quick things to add. All comments are trivially addressable and probably would've come up anyways during your checks so I hope they speed things up for you.

As far as Ruff formatting goes I think it will only end up changing 3 files when you run it. Currently the workflow breaks but it should pass once you run the formatter.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.22222% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.24%. Comparing base (6e6a067) to head (5f3ce07).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/yasa/evaluation.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
- Coverage   83.93%   77.24%   -6.69%     
==========================================
  Files          24       13      -11     
  Lines        3536     2659     -877     
  Branches        0      324     +324     
==========================================
- Hits         2968     2054     -914     
  Misses        568      568              
- Partials        0       37      +37     

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[raphaelvallat]

Note that there's a CI failure on Python 3.12 because of a depreceated import of pkg_resources in the lspopt dependency

https://github.com/hbldh/lspopt/blob/6867aa95e9ced721defc07027e8231973ecb4f26/lspopt/data/__init__.py#L11

See mu-editor/mu#2485

[raphaelvallat]

Ready for review @remrama ! There's one CI failure because of coverage that I think we can ignore

[remrama]

Looks great @raphaelvallat! Thanks a lot for doing this, I think it makes it easier to work on subsequent PRs.

[raphaelvallat]

PR ready to be merged as soon as #127 is merged!