[Task] Add support for syncing m.status and m.call over Sliding Sync via MSC4262

A requirement for #6616 to work with clients using Sliding Sync such as Element X is to implement support for the sliding sync extension defined in [MSC4262](https://github.com/tcpipuk/matrix-spec-proposals/blob/patch-2/proposals/4262-sliding-sync-profiles.md).