AsComponents::serialize is now AsComponents::as_batches and returns Collection<ComponentBatch>

[Wumpf]

What

See title. This is a breaking change for custom AsComponents implementations. But we had plenty of breaking changes in that area, so now it's the right time.

The rename serialize to as_batches is motivated by the fact that previously we typically did to-arrow serializations in AsComponents. This is no longer the case and it's more of a collecting operation, just as we do in Rust's AsComponents::as_serialized_batches - since C++ only has ComponentBatch and no SerializedComponentBatch it follows that the method is just called as_batches now.

The change in return type fixes an old todo (no ticket) for using rerun::Collection for more flexibility in this area (pending improvements to rerun::Collection) and making our API handling more consistent in that regard.

[github-actions]

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Result	Commit	Link
✅	d58128e	https://landing-b1e4oxcrp-rerun.vercel.app/docs

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Result	Commit	Link	Manifest
✅	d58128e	https://rerun.io/viewer/pr/8884	+nightly +main

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