support newest jiter behaviour

[samuelcolvin]

• use the newest jiter with support for string caching
• use jiter's python_parse to parse python when there's no validator, this should make JSON validation for Any fields significantly faster

[codecov]

Codecov Report

Merging #1092 (755ce61) into main (5b63e7a) will increase coverage by 0.06%.
The diff coverage is 86.36%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1092      +/-   ##
==========================================
+ Coverage   89.64%   89.70%   +0.06%     
==========================================
  Files         106      106              
  Lines       16363    16359       -4     
  Branches       35       35              
==========================================
+ Hits        14668    14675       +7     
+ Misses       1688     1677      -11     
  Partials        7        7              

Files	Coverage Δ
src/input/input_abstract.rs	70.58% <ø> (ø)
src/input/input_json.rs	89.16% <ø> (+0.72%)	⬆️
src/input/input_python.rs	97.79% <ø> (-0.05%)	⬇️
src/input/input_string.rs	37.95% <ø> (+1.84%)	⬆️
src/input/shared.rs	97.16% <ø> (-0.23%)	⬇️
src/validators/mod.rs	95.15% <100.00%> (+0.06%)	⬆️
src/validators/json.rs	98.38% <96.77%> (-1.62%)	⬇️
src/lib.rs	87.14% <0.00%> (+1.22%)	⬆️

... and 1 file with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5b63e7a...755ce61. Read the comment docs.

[codspeed-hq]

CodSpeed Performance Report

Merging #1092 will improve performances by 14.74%

_{Comparing new-jiter (755ce61) with main (5b63e7a)}

Summary

⚡ 1 improvements
✅ 139 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	new-jiter	Change
⚡	test_small_class_core_model	58.5 µs	51 µs	+14.74%