feat: abstract interface for jit wrapped function and type hint enhancements

[Qazalbash]

No description provided.

[f0uriest]

Thanks for the PR!

I'm happy with the improved type hints in the .py files, but I haven't fully come around to having dedicated interface files .pyi. Can you say a little more about the motivation? Most type checkers can read type hints from the source code just fine so I don't see the need for the extra file.

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All modified and coverable lines are covered by tests ✅

Project coverage is 97.92%. Comparing base (b9f7ba5) to head (32d567d).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #60   +/-   ##
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  Coverage   97.92%   97.92%           
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  Files           7        7           
  Lines         965      966    +1     
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+ Hits          945      946    +1     
  Misses         20       20           

Files with missing lines	Coverage Δ
interpax/_fourier.py	100.00% <100.00%> (ø)
interpax/_ppoly.py	96.93% <100.00%> (ø)
interpax/_spline.py	97.73% <100.00%> (ø)

[Qazalbash]

I'm so sorry, I opened this PR late at night and forgot to add the details.

I recently had a chance to explore your projects, interpax, and quadax, and every time I hover over a function or class to see their parameters, it shows jit wrapped like in the screenshot below. By adding an abstract interface, it is easier to see the signature of a function or details of the class. With the help of these suggestions, I don't have to constantly look into documentation.

Without interface

With interface

I have also noticed for many functions, you haven't specified the return type.