Housekeeping/clean code up

[CosmoMatt]

Scope crept quite a lot on this but still effectively housekeeping.
Main contributions:

Housekeeping

• Restructure code to be more consistant.
• Update api docs inline with above.
• Clean floating files (notebooks from previous work)
• Combine tests into one overloaded pytest function.
• Switch s2fft dependency to v1.0.2

Added features

• Add switch to avoid duplicating highest wavelet scale memory.
• Pull through support for Torch frontend and test
• Add Torch support to all docs and api autodocs
• Pull through support for Gauss-Legendre (GL) sample locations
• Add torch notebook and update across the board

C backend support for SSHT operations

• port through JAX frontend support for C backend.

CI related

• Enhance codecov to > 90%

[codecov]

Codecov Report

Attention: Patch coverage is 91.53005% with 31 lines in your changes are missing coverage. Please review.

Project coverage is 91.99%. Comparing base (c5702aa) to head (6394602).

Files	Patch %	Lines
s2wav/filters.py	88.10%	22 Missing ⚠️
s2wav/transforms/wavelet_precompute_torch.py	92.30%	4 Missing ⚠️
s2wav/samples.py	91.66%	2 Missing ⚠️
s2wav/transforms/wavelet.py	93.93%	2 Missing ⚠️
s2wav/transforms/construct.py	96.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   88.31%   91.99%   +3.67%     
==========================================
  Files           8        7       -1     
  Lines         522      587      +65     
==========================================
+ Hits          461      540      +79     
+ Misses         61       47      -14     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jasonmcewen]

Looks good @matt. I've approved so you can merge.

At some point we should avoid this notebook links and use the better approach we're now following for s2fft. If you prefer not to do this now could you make an issue so we don't forget.

[CosmoMatt]

@jasonmcewen I'm not sure I follow. What notebook links do you mean?

[jasonmcewen]

@CosmoMatt There appear to be nblink files in the repo? Remember we chances how the notebooks were set up for colab support in s2fft?