Lazy imports for Python 3.15+

[hugovk]

Before: 5 ms	After: ~0 ms

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.56%. Comparing base (823ad60) to head (141baae).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #335   +/-   ##
=======================================
  Coverage   99.55%   99.56%           
=======================================
  Files          12       12           
  Lines         909      913    +4     
=======================================
+ Hits          905      909    +4     
  Misses          4        4           

Flag	Coverage Δ
macos-latest	97.59% <100.00%> (+0.01%)	⬆️
ubuntu-latest	97.59% <100.00%> (+0.01%)	⬆️
windows-latest	95.72% <100.00%> (+0.01%)	⬆️

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[codspeed-hq]

Merging this PR will not alter performance

✅ 15 untouched benchmarks

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_{Comparing hugovk:lazy (141baae) with main (823ad60)}