### What * Part of: #2919 * Fixes #3256 * just like in Rust it's actually `as_component_lists`, we return a vector of type erased component arrays that know how to serialize themselves, dubbed `AnonymousComponentList` for now. * I'm not happy with naming and internals of `AnonymousComponentList`. This smells very much like we should have actual inheritance somewhere, but it's a bit tricky since we want to extract pointer out of arbitrary list types, giving rise to the type aware `ComponentList`. Overall the approach here tries to mimic Rust but ultimately misses the target, since, well this is not Rust. To be revisited, maybe it is just a naming issue! * Fixes #3255 * indicators are regular components now, their handling in `as_component_lists` is very slightly dubious since they're not backed by data but ofc indicator components don't have any data to begin with 🤷 * Fixes #3040 * First step towards #3050 Trigger of this PR was the inability to deal with mono components like `DrawOrder` -> need splatting -> don't want to implement splatting separately for components & archetype -> implement as_components-style Quick throw-away test for splatting radius on the random point demo: <img width="943" alt="image" src="https://github.com/rerun-io/rerun/assets/1220815/d256b281-34c7-4d6c-a143-b4d604a13b75"> ### Checklist * [x] I have read and agree to [Contributor Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and the [Code of Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md) * [x] I've included a screenshot or gif (if applicable) * [x] I have tested [demo.rerun.io](https://demo.rerun.io/pr/3258) (if applicable) - [PR Build Summary](https://build.rerun.io/pr/3258) - [Docs preview](https://rerun.io/preview/f732aad18515476d81d57b89108e08f787729ae6/docs)  - [Examples preview](https://rerun.io/preview/f732aad18515476d81d57b89108e08f787729ae6/examples)  - [Recent benchmark results](https://ref.rerun.io/dev/bench/) - [Wasm size tracking](https://ref.rerun.io/dev/sizes/)

Archetypes should implement as_components - C++ #3256

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