Dataframe view update and blueprint API (part 0): introduce view object and improve doc generation

[abey79]

What

This PR introduces a stub blueprint view object for the dataframe view. It doesn't contain any actual parameters (query, etc.), but is sufficient to "spawn" a view. This PR also improves doc generation by special casing the dataframe view (it accepts all archetypes and inversely).

(Note: the snippet will be much improved in later PRs.)

---

Part of a series to address #6896 and #7498.

All PRs:

• Dataframe view update and blueprint API (part 0): introduce view object and improve doc generation #7515
• Dataframe view update and blueprint API (part 1): introduce fbs for the new query property #7516
• Dataframe view update and blueprint API (part 2): UI for the query #7527
• Dataframe view update and blueprint API (part 3): use the new query object for column visibility #7545
• Dataframe view update and blueprint API (part 4): blueprint API #7551
• Dataframe view update and blueprint API (part 5): switch to re_dataframe2 #7572
• Dataframe view update and blueprint API (part 6): cleanup #7573

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
• Recent benchmark results
• Wasm size tracking

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

[github-actions]

Deployed docs

Commit	Link
14f487f	https://landing-hzn2iqsvj-rerun.vercel.app/docs

[Wumpf]

lgtm!