To create a custom exporter you must have a
struct that implements the
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Exportis called asynchronously with a list of
exporter.FeatureEventthat have been collected.
It is your responsibility to store them where you want.
IsBulk function should return
false if the exporter can handle the results in stream mode.
If you decide to manage it in streaming mode, everytime we call a variation the
Export function will be called
with only on event in the list.