Default validator

[samuelcolvin]

continuing from #200, moving default and on_error behaviour into separate validator for reuse in other places.

@PrettyWood this is ready to review and will be ready to merge soon. But I know you're busy so I'll probably merge once I'm happy unless anyone brings up problems.

TODO:

• check performance doesn't get worse
• support positional tuples
• coverage

[codecov-commenter]

Codecov Report

Merging #234 (288acb6) into main (cea60f8) will decrease coverage by 0.11%.
The diff coverage is 95.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #234      +/-   ##
==========================================
- Coverage   98.65%   98.54%   -0.12%     
==========================================
  Files          48       49       +1     
  Lines        5057     5139      +82     
  Branches       35       36       +1     
==========================================
+ Hits         4989     5064      +75     
- Misses         68       75       +7     

Impacted Files	Coverage Δ
src/build_tools.rs	96.00% <0.00%> (-1.30%)	⬇️
src/errors/line_error.rs	97.18% <0.00%> (-1.39%)	⬇️
src/validators/date.rs	95.18% <0.00%> (-1.17%)	⬇️
src/validators/arguments.rs	99.17% <92.00%> (-0.83%)	⬇️
src/validators/typed_dict.rs	98.61% <96.96%> (-0.29%)	⬇️
src/validators/with_default.rs	98.61% <98.61%> (ø)
pydantic_core/schema_types.py	100.00% <100.00%> (ø)
src/errors/validation_exception.rs	98.00% <100.00%> (+0.02%)	⬆️
src/validators/mod.rs	98.34% <100.00%> (+0.01%)	⬆️

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[samuelcolvin]

replaced by #242 to try to get codecov to work 😠.