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This is being introduced as part of Sliding Sync but doesn't have any sliding window component. It's just a way to get E2EE events without having to sit through a big initial sync (`/sync` v2). And we can avoid encryption events being backed up by the main sync response or vice-versa.
Part of some Sliding Sync simplification/experimentation. See [this discussion](https://github.com/element-hq/synapse/pull/17167#discussion_r1610495866) for why it may not be as useful as we thought.
Based on:
- https://github.com/matrix-org/matrix-spec-proposals/pull/3575
- https://github.com/matrix-org/matrix-spec-proposals/pull/3885
- https://github.com/matrix-org/matrix-spec-proposals/pull/3884
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