Redo the HVP selection

[rsenne]

PR for #38.

@gdalle does this make sense to you?

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.00%. Comparing base (c8b480e) to head (571e863).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   89.61%   90.00%   +0.39%     
==========================================
  Files           7        7              
  Lines        1069     1071       +2     
==========================================
+ Hits          958      964       +6     
+ Misses        111      107       -4     

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[gdalle]

If we're using DI's machinery for this, might as well use it all the way and leverage DI.hvp_mode? It is inspired by https://iclr-blogposts.github.io/2024/blog/bench-hvp/

https://github.com/JuliaDiff/DifferentiationInterface.jl/blob/233ba49a8dc39ea006c376bca44946e9d11add6a/DifferentiationInterface/src/utils/traits.jl#L158-L170