add flag to allow only finite float values

[PrettyWood]

fix #224

[codecov-commenter]

Codecov Report

Merging #228 (ed56450) into main (fdf42b8) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #228      +/-   ##
==========================================
+ Coverage   98.66%   98.69%   +0.02%     
==========================================
  Files          48       48              
  Lines        5031     5053      +22     
  Branches       35       35              
==========================================
+ Hits         4964     4987      +23     
+ Misses         67       66       -1     

Impacted Files	Coverage Δ
src/errors/kinds.rs	99.15% <ø> (ø)
pydantic_core/_types.py	100.00% <100.00%> (ø)
src/input/input_json.rs	97.51% <100.00%> (ø)
src/input/input_python.rs	98.67% <100.00%> (ø)
src/validators/float.rs	98.90% <100.00%> (+0.13%)	:arrow_up:
src/validators/typed_dict.rs	98.89% <0.00%> (+<0.01%)	:arrow_up:
... and 2 more

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[PrettyWood]

@tiangolo are you happy with such a flag?

[PrettyWood]

Thanks for the review! Feedback taken

[samuelcolvin]

this is great, thanks so much.