chore(dataobj): logs section metadata and encoding/decoding #15720
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This PR introduces metadata for a "logs section," which is intended to hold a sequence of log records across one or more streams.
The code is a near-identical copy of #15676. Future work is needed to identify if dataset sections can have their encoding, decoding, and dataset implementations deduplicated.
To keep the PR small, code to build the logs section (the equivalent of #15713) is not included, and will be introduced in a follow-up PR.