Migrate to group::CurveAffine

[str4d]

Depends on zkcrypto/group#48.

[codecov-commenter]

Codecov Report

Patch coverage: 33.33% and project coverage change: +0.45% 🎉

Comparison is base (a586b8c) 72.09% compared to head (fb643a4) 72.54%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   72.09%   72.54%   +0.45%     
==========================================
  Files          10       10              
  Lines        1272     1264       -8     
==========================================
  Hits          917      917              
+ Misses        355      347       -8     

Files Changed	Coverage Δ
benches/point.rs	0.00% <0.00%> (ø)
src/arithmetic/curves.rs	0.00% <ø> (ø)
src/serde_impl.rs	83.33% <ø> (ø)
src/curves.rs	56.45% <50.00%> (+1.06%)	⬆️

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