Defer imports for faster overall import time: 5 ms -> 3 ms

[hugovk]

Follow on from #234.

Before: 5 ms

After: 3 ms

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.49%. Comparing base (4762bdd) to head (aaef964).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #238   +/-   ##
=======================================
  Coverage   99.48%   99.49%           
=======================================
  Files          11       11           
  Lines         782      796   +14     
=======================================
+ Hits          778      792   +14     
  Misses          4        4           

Flag	Coverage Δ
macos-latest	97.73% <100.00%> (+0.04%)	⬆️
ubuntu-latest	97.73% <100.00%> (+0.04%)	⬆️
windows-latest	95.97% <100.00%> (+0.07%)	⬆️

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