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This change makes InternalHistogram the only InternalAggregation used by the Histogram Aggregator. There is still a separate Bucket implementation and Factory implementation. All buckets are created through the factory passed into the InternalHistogram meaning and the correct factory implementation is serialised as part of the aggregation to make sure the correct bucket types are always generate.
This is needed by the Transformers (namely the derivative transformer) to allow it to generate buckets of the right type without having to know what the underlying bucket implementation is.