A closed stream scope: which scope it is, how it was closed (:complete_stream for an operator's call, :closing_event for a closing event), by whom, and when.
:complete_stream
:closing_event
@type t() :: %Chronicle.EventSequences.Streams.ClosedStream{ closed_at: term(), closed_by: term(), event_source_id: term(), event_source_type: term(), event_stream_id: term(), event_stream_type: term(), origin: term(), sequence_number: term() }