Function sync_events_handler 

pub(crate) async fn sync_events_handler(
    state: State<ServerState>,
    __arg1: AuthenticatedClaims,
    __arg2: RumaRequest<Request>,
) -> Result<ArminiusResponse<Response>, SyncV4Error>

Handler for POST /_matrix/client/unstable/org.matrix.simplified_msc3575/sync (See https://github.com/matrix-org/matrix-spec-proposals/blob/erikj/sss/proposals/4186-simplified-sliding-sync.md).

Endpoint implementing Simplified Sliding Sync (See https://bundesmessenger.gitlab.io/backend/neo/arminius/arminius/adrs/simplified-sliding-sync.html).

NOTE: This endpoint is unstable.