apache / apache/beam

Cleanup metrics/counters code

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core P3 python task
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Description

E.g. right now we have

metricbase.Distribution
metric.DelegatingDistribution
metric.cells.DistributionCell
metric.cells.DistributionResult
metric.cells.DistributionData
metric.cells.DistributionAggregator
transforms.cy_combiners.DataflowDistributionCounter
transforms.cy_combiners.DataflowDistributionCounterFn
transforms.cy_dataflow_distribution_counter.DataflowDistributionCounter

plus some code under util/counters. This is true for "ordinary" sum and max counters as well. We should consolidate/simplify this code. 

 

Imported from Jira [BEAM-4074](https://issues.apache.org/jira/browse/BEAM-4074). Original Jira may contain additional context.
Reported by: robertwb.

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