Add `Ellipsoids3D` archetype. #7561

Job	Run time
Checks / Python lints (ruff, mypy, …)	37s
Checks / Test Python Docs	33s
Checks / Check if running codegen would produce any changes	1m 54s
Checks / Rust lints (fmt, check, clippy, tests, doc)	22m 35s
Checks / Rerun lints	35s
Checks / Spell Check	8s
Checks / C++ formatting check	3m 37s
Checks / C++ tests	10m 39s
Python / Build Wheels	1m 54s
	42m 32s

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