support future and past dates and datetimes

[samuelcolvin]

fix #229.

Also fix behaviour when float('nan') is passed to datetime types.

[codecov-commenter]

Codecov Report

Merging #295 (ce01304) into main (800114b) will decrease coverage by 0.08%.
The diff coverage is 92.43%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #295      +/-   ##
==========================================
- Coverage   97.52%   97.44%   -0.09%     
==========================================
  Files          54       54              
  Lines        6131     6212      +81     
  Branches       44       44              
==========================================
+ Hits         5979     6053      +74     
- Misses        152      159       +7     

Impacted Files	Coverage Δ
src/errors/kinds.rs	78.24% <ø> (ø)
src/validators/date.rs	95.00% <89.65%> (-1.35%)	⬇️
src/validators/datetime.rs	94.11% <90.47%> (-3.89%)	⬇️
pydantic_core/core_schema.py	100.00% <100.00%> (ø)
src/input/datetime.rs	97.90% <100.00%> (+0.05%)	⬆️
src/input/input_json.rs	96.38% <100.00%> (ø)
src/input/input_python.rs	98.54% <100.00%> (ø)

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