feat: transform old schema

[tlambert03]

closes #98

[codspeed-hq]

CodSpeed Performance Report

Merging #199 will not alter performance

_{Comparing transform (1b2d0e8) with main (97fdaf6)}

Summary

✅ 7 untouched benchmarks

[codecov]

Codecov Report

Merging #199 (1b2d0e8) into main (97fdaf6) will increase coverage by 0.08%.
The diff coverage is 96.47%.

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
+ Coverage   97.19%   97.27%   +0.08%     
==========================================
  Files          24       23       -1     
  Lines         890      919      +29     
==========================================
+ Hits          865      894      +29     
  Misses         25       25              

Impacted Files	Coverage Δ
src/ome_types/_conversion.py	96.98% <96.35%> (+2.36%)	⬆️
src/ome_autogen/_util.py	100.00% <100.00%> (ø)
src/ome_types/__init__.py	100.00% <100.00%> (ø)
src/ome_types/_mixins/_base_type.py	98.73% <100.00%> (-0.02%)	⬇️
src/ome_types/_mixins/_ome.py	97.91% <100.00%> (ø)

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