Check rerun notebook version on first import

[jprochazk]

What

• Part of https://github.com/rerun-io/rerun/issues/7814

Side note: Should this close the above issue? We said we'd prefer to express version requirements in the context of pip instead of a warning

Checklist

• [x] I have read and agree to Contributor Guide and the Code of Conduct

• [x] I've included a screenshot or gif (if applicable)

• [x] 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

• [x] The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG

• [x] If applicable, add a new check to the release checklist!

• [x] 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.

[jprochazk]

Tested by installing rerun-notebook, then updating crate versions to 0.21.0-alpha.1 and installing rerun-sdk:

I tried using the warnings module for this, but I don't really understand how it works. I had to set a filter to actually see the warning, which seems bad? Should this just be a print instead?