New cross-language example snippet better demonstrating image formats

[Wumpf]

What

• Fixes Add more examples for different image formats #7691

Also unearthed a snippet that showed use with PIL & OpenCV which we didn't reference so far 😱 . Overlapping, but still useful on its own, so I put it into our docs as well!

Checklist

• pass main ci
• 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

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

To run all checks from main, comment on the PR with @rerun-bot full-check.

[Wumpf]

@rerun-bot full-check

[github-actions]

Deployed docs

Commit	Link
9dd17c2	https://landing-r4ou3rajr-rerun.vercel.app/docs

[github-actions]

Started a full build: https://github.com/rerun-io/rerun/actions/runs/11372046053

[Wumpf]

main ci passed the relevant check - snippet comparision - earlier. Now cpp builds are also green which previously failed, so this should be fine!