refactor: remove support for pydantic v1

[tlambert03]

closes #274

won't merge this one without approval

[codecov]

Codecov Report

Attention: Patch coverage is 94.28571% with 2 lines in your changes missing coverage. Please review.

Project coverage is 86.52%. Comparing base (ae694b6) to head (aba74e3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ome_types/_mixins/_kinded.py	90.00%	1 Missing ⚠️
src/ome_types/widget.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
- Coverage   86.95%   86.52%   -0.44%     
==========================================
  Files          25       25              
  Lines        1273     1247      -26     
==========================================
- Hits         1107     1079      -28     
- Misses        166      168       +2     

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[codspeed-hq]

CodSpeed Performance Report

Merging #275 will not alter performance

_{Comparing drop-pydantic1 (aba74e3) with main (ae694b6)}

Summary

✅ 9 untouched benchmarks

[jmuhlich]

I agree that it's time to let v1 support go. It's so cathartic to rip out this kind of code.

[tlambert03]

The main thing that people may now see is that using .dict() and other v1 methods will now reveal the deprecation warnings that pydantic-compat was hiding. So you may need to change some code after this