Fail codegen when archetype fields don't have one of the required attributes

[abey79]

What

All of our archetypes' fields must have one of the attr.rerun.component_{required|recommended|optional} attribute. Let's fail codegen when they are missing, so we stop falling into that pitfall.

[github-actions]

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Result	Commit	Link
✅	0c8541e	https://rerun.io/viewer/pr/8326

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[Wumpf]

lgtm.. hower, I didn't realize you put this into the rust codegen when this is actually completely language agnostic.
this should go into Objects::from_raw_schema which is where we have general validation like this
... but I don't want to hold up if this turns out to be too much hassle.

[Wumpf]

thanks!