[dogstatsd] Add support for configurable histogram percentile names #2832
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What does this PR do?
This PR makes it possible to customize the histogram percentile names.
Motivation
If DD dashboards have been built with different metric names for percentiles, this makes it easier to conform to those, rather than updating all the dashboards.
Additional Notes
If an invalid format is provided, the agent will log a warning (when flushing the metric) and default to the existing name format.