ci: add dataclasses benchmarks

[tlambert03]

adding benchmarks to time the creation of evented dataclasses, and time to setattr

[codspeed-hq]

CodSpeed Performance Report

Merging #189 new-bench (4d86ced) will not alter performances.

Summary

🔥 0 improvements
❌ 0 regressions
✅ 58 untouched benchmarks

🆕 8 new benchmarks
⁉️ 0 dropped benchmarks

Benchmarks breakdown

	Benchmark	main	new-bench	Change
🆕	test_dataclass_group_create[dataclass]	N/A	1.6 ms	N/A
🆕	test_dataclass_group_create[pydantic]	N/A	1.6 ms	N/A
🆕	test_dataclass_group_create[attrs]	N/A	1.7 ms	N/A
🆕	test_dataclass_group_create[msgspec]	N/A	1.7 ms	N/A
🆕	test_dataclass_setattr[dataclass]	N/A	3.3 ms	N/A
🆕	test_dataclass_setattr[pydantic]	N/A	3.4 ms	N/A
🆕	test_dataclass_setattr[attrs]	N/A	3.3 ms	N/A
🆕	test_dataclass_setattr[msgspec]	N/A	3.2 ms	N/A

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (f700406) compared to base (c4cb74a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #189   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files           17        17           
  Lines         1569      1569           
=========================================
  Hits          1569      1569           

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