Make Python PS torch compatible

[PicoCentauri]

---

📚 Documentation preview 📚: https://rascaline--220.org.readthedocs.build/en/220/

[github-actions]

Here is a pre-built version of the code in this pull request: wheels.zip, you can install it locally by unzipping wheels.zip and using pip to install the file matching your system

[Luthaf]

A bit more cleanup and this should be good to go!

[PicoCentauri]

Thanks for the cleanup!

[PicoCentauri]

I wonder why torch was complaining about the change of the forward function. The compiler was telling

E           Unknown type name 'CalculatorBase':
E             File "/Users/philiploche/repos/rascaline/.tox/torch-tests/lib/python3.11/site-packages/rascaline/utils/power_spectrum/calculator.py", line 12
E               def __init__(
E                   self,
E                   calculator_1: CalculatorBase,
E                                 ~~~~~~~~~~~~~~ <--- HERE
E                   calculator_2: Optional[CalculatorBase] = None,
E               ):
E           'PowerSpectrum.__init__' is being compiled since it was called from '__torch__.rascaline.torch.utils.power_spectrum.calculator.PowerSpectrum'

But he already had compiled the non-torch Power Spectrum version...

[Luthaf]

This also required some changes in time-graph to make valgrind happy: Luthaf/time-graph@eabad48