Add ability to specify dataclass name in dataclass_schema

[dmontagu]

This change would be necessary to get the type parameters into the generated loc values when working with generic dataclasses.

I think regardless of what we do with generic dataclasses this is probably a change worth making as:

• there is no validation-time performance cost, and
• we can fully control whether there is any change in behavior from the pydantic side

Even though generic dataclasses isn't ready yet on the pydantic side, I'll open this now as I think it will be necessary no matter what we do there.

[dmontagu]

Note the value in ctx and msg comes from the dataclass_args_schema, whereas the value in loc comes from the dataclass_schema.

[codspeed-hq]

CodSpeed Performance Report

Merging #603 generic-dataclass-name (6560e78) will not alter performances.

Summary

🔥 0 improvements
❌ 0 regressions
✅ 115 untouched benchmarks

🆕 3 new benchmarks
⁉️ 0 dropped benchmarks

Benchmarks breakdown

	Benchmark	main	generic-dataclass-name	Change
🆕	test_set_of_ints_core_duplicates	N/A	7.8 ms	N/A
🆕	test_set_of_ints_core_json_duplicates	N/A	4.6 ms	N/A
🆕	test_frozenset_of_ints_duplicates_core	N/A	1.1 ms	N/A

[dmontagu]

Actually, I guess this may be unnecessary if we take the parametrizations-are-subclasses approach for dataclasses the way we do for BaseModel. I was hoping to avoid that but maybe that's the right way to do it.

[samuelcolvin]

otherwise LGTM

[codecov-commenter]

Codecov Report

Merging #603 (cbfcc22) into main (3603f10) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head cbfcc22 differs from pull request most recent head 6560e78. Consider uploading reports for the commit 6560e78 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #603      +/-   ##
==========================================
+ Coverage   94.11%   94.13%   +0.02%     
==========================================
  Files          98       98              
  Lines       13177    13188      +11     
  Branches       25       25              
==========================================
+ Hits        12401    12414      +13     
+ Misses        770      768       -2     
  Partials        6        6              

Impacted Files	Coverage Δ
pydantic_core/core_schema.py	96.88% <100.00%> (+<0.01%)	⬆️
src/validators/dataclass.rs	98.24% <100.00%> (+3.97%)	⬆️

... and 3 files with indirect coverage changes

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