Generate archetype field info (opt-in for a single type so far) and use it in blueprint property ui

[Wumpf]

What

• Part of First draft of generic UI for space view properties #6237
  • I think the "only" part left now is to use this for all blueprint properties
    • the tricky bit here is that this is dependent on Support per-space-view-class property defaults #4194

This creates an tight nit & generic coupling from our type definitions to the ui! This is to be used in all blueprint properties, so far used on PlotLegend only.

Drawbacks:

• lower snake case because that's what our fields look like - we could change that easily but there's some value to that because that's what all SDKs use as field names. Very much open for discussion!
• some parts of the doc strings might be weird outside of the context of the ui, but I can live with that

Future stuff:

• we could very very easily now also add reference doc links in there via some linking mechanism (viewer could choose depending on preference or source sdk)

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
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[Wumpf]

Improved!

[abey79]

Nice!