Nyall Dawson fc339f9ac5 Add a flag argument to QgsFeatureSink::addFeatures
Flags can be used to control how features are added to the sink.

For now, there's only a single flag available - FastInsert.
When FastInsert is set, faster inserts will be use at the cost
of updating the passed features to reflect changes made at the
provider.

This includes skipping the update of the passed feature IDs
to match the resulting feature IDs for the feature within
the data provider.

Individual sink subclasses may or may not choose to respect
this flag, depending on whether or not skipping this update
represents a significant speed boost for the operation.

QgsVectorLayer always ignores the flag - feature ids are
required for the featureAdded signal to be correctly emitted,
and it's expected that performance critical applications will
add features directly to a data provider instead of
via QgsVectorLayer's edit buffer.
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