Cached 2D & 3D arrow clouds

[teh-cmc]

Grunt work to make arrow clouds go through the cached APIs.

Performance comparison

Using the clock example, with the minutes hand set to -inf:+inf.

main:

now:

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TODO:

• self-review
• check doc examples still work
  • arrow2d_simple
  • arrow3d_simple
• perf comparison

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
• I've included a screenshot or gif (if applicable)
• I have tested the web demo (if applicable):
  • Using newly built examples: app.rerun.io
  • Using examples from latest main build: app.rerun.io
  • Using full set of examples from nightly build: app.rerun.io
• The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG
• If applicable, add a new check to the release checklist!

• PR Build Summary
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• Recent benchmark results
• Wasm size tracking

[Wumpf]

another great "free" speedup, not bad!