Add std::chrono timing for mesh generation benchmark

[ghutchis]

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[ghutchis]

This is not intended to merge - I'm using it to benchmark performance for the eventual Avogadro 2 manuscript.

[github-actions[bot]]

Here are the build results Avogadro2.AppImage macOS.dmg Ubuntu-Latest.tar.gz Win64.exe Artifacts will only be retained for 90 days.

[github-actions[bot]]

Here are the build results Avogadro2.AppImage Ubuntu-Latest.tar.gz macOS.dmg Win64.exe Artifacts will only be retained for 90 days.

[ghutchis]

Okay, the timing is done for the eventual manuscript. Closing this, since we'll switch to flying edges shortly.