ContainerRuntime Async Summarization

[scarlettjlee]

Work Item

Separate capture from serialization/upload for ContainerRuntime to match the same work for DDSs.

See #7615 for full details.

From Vlad:
"I think we should have an item to apply this design to ContainerRuntime, i.e. how it summarizes data stores themselves.
This will ensure that system is symmetrical, and that it does not become another road block on the path to #3469.

"That said, this can be done as the very last item, as it will not block the remaining of the work and ability of clients like Whiteboard to leverage async DDS summarization flow."

[microsoft-github-policy-service]

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