Add an example to display OpenStreetMap-sourced data on the map view

[abey79]

What

That serves as a basic example on how to source OpenStreetMap data and display it on a map view. Included both online and in-viewer.

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

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

[github-actions]

Latest documentation preview deployed successfully.

Result	Commit	Link
✅	9d49e7f	https://landing-67a5i2u5b-rerun.vercel.app/docs

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[zehiko]

such a "randomly" picked location :)

[abey79]

😇

[abey79]

@rerun-bot full-check

[github-actions]

Started a full build: https://github.com/rerun-io/rerun/actions/runs/11744344143