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This PR accumulates many refactorings and small improvements that I did while preparing the next change set of https://github.com/druid-io/druid/projects/2. I finally decided to make them a separate PR to minimize the volume of the main PR. Some of the changes: - Renamed confusing "Generic Column" term to "Numeric Column" (what it actually implies) in many class names. - Generified `ComplexMetricExtractor`