Add a completion_number parameter to the add_perf_event Python API
(AddPerfEvent scriptable method) and a matching field on
RimWellEventPerf. When a timeline perforation event is materialised into
a RimPerforationInterval, a non-zero completion number is copied across,
so it flows through the existing completion-data path onto
RigCompletionData.
The schedule generator now emits COMPLUMP alongside COMPDAT: COMPDAT
generation is folded into generateCompletionsForWell, which computes the
completion data once and builds both keywords from it via the existing
RimKeywordFactory::complumpKeyword (added in #13273). COMPLUMP only
produces records for perforations that have a completion number and is
merged across wells like COMPDAT.