implementing validate_strings

[samuelcolvin]

• Complex: do something clever with InputValue and/or as_error_value to either make error.into_owned() cheaper or reduce its use dh - resolved in make error "duplicate" cheaper #950
• Mechanical: needs to work on dataclass as well as model and typed_dict
• Trivial: Move the String implementation of Input back into input_json as it's ownly used by JSON keys.
• (from @davidhewitt) - rename to validate_strings

Selected Reviewer: @dmontagu

[codspeed-hq]

CodSpeed Performance Report

Merging #883 will improve performances by 34.14%

_{Comparing validate_string (126bebc) with main (1d10238)}

Summary

⚡ 3 improvements
✅ 135 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	validate_string	Change
⚡	test_chain_function	46.8 µs	34.9 µs	+34.14%
⚡	test_chain_nested_functions	56.3 µs	43.5 µs	+29.56%
⚡	test_variable_tuple	39.4 µs	34.2 µs	+15.2%

[codecov]

Codecov Report

Merging #883 (72f979a) into main (245381f) will decrease coverage by 0.63%.
Report is 5 commits behind head on main.
The diff coverage is 60.81%.

❗ Current head 72f979a differs from pull request most recent head 126bebc. Consider uploading reports for the commit 126bebc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #883      +/-   ##
==========================================
- Coverage   93.78%   93.16%   -0.63%     
==========================================
  Files         105      106       +1     
  Lines       15539    15744     +205     
  Branches       25       25              
==========================================
+ Hits        14574    14668      +94     
- Misses        959     1070     +111     
  Partials        6        6              

Files Changed	Coverage Δ
src/errors/mod.rs	92.30% <ø> (ø)
src/input/mod.rs	100.00% <ø> (ø)
src/validators/typed_dict.rs	96.49% <0.00%> (-0.86%)	⬇️
src/input/input_string.rs	29.92% <29.92%> (ø)
src/input/input_abstract.rs	86.76% <45.45%> (-3.64%)	⬇️
src/validators/union.rs	89.06% <50.00%> (-0.24%)	⬇️
src/validators/dict.rs	87.30% <80.00%> (-0.67%)	⬇️
src/validators/generator.rs	90.94% <85.71%> (ø)
src/input/return_enums.rs	85.30% <86.66%> (+0.03%)	⬆️
src/input/input_json.rs	90.47% <88.88%> (-1.36%)	⬇️
... and 12 more

... and 1 file with indirect coverage changes

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[davidhewitt]

please review