Add USD to Simularium converter#206

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dillonl wants to merge 3 commits intosimularium:mainfrom

Commits on Mar 30, 2026

Add USD converter for importing Universal Scene Description files
dillonl
committed

Commits on Mar 31, 2026

Fix USD rotation convention to match THREE.js Euler('XYZ')
dillonl
committed
Clean up USD converter: remove stale comments, unused imports, and improve error handling
dillonl
committed