Add example for different data per timeline on Events and Timelines doc page

[Wumpf]

What

Preview: https://landing-7a6fnura2-rerun.vercel.app/docs/concepts/timelines#reset-active-timeline--differing-data-per-timeline

After answering with this example on Discord, I noticed we haven't documented this ability anywhere. Added a three language snippet + a little bit of text to the Events and Timelines doc page.

Tested examples locally using pixi run python .\docs\snippets\compare_snippet_output.py concepts/different_data_per_timeline.

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 examples from latest main build: rerun.io/viewer
  • Using full set of examples from nightly build: rerun.io/viewer
• 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!
• If have noted any breaking changes to the log API in CHANGELOG.md and the migration guide

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[github-actions]

Deployed docs

Commit	Link
73cface	https://landing-503jqzj43-rerun.vercel.app/docs

[Wumpf]

drafted: this didn't actually run the snippet because of an incorrect setting in snippets.toml
and now I get strange crashes I have to investigate

[abey79]

Very nice addition 👍🏻

[Wumpf]

requires

• Fix resetting time destroying recording stream #6914