Add Distribution Support to Semantic Metric FastForward http Reporter

[ao2017]

Heroic histogram data is currently computed locally.
It is practically impossible to aggregate percentile.
We are adding distribution to heroic to address that issue. Distribution will create data sketch that will be used upstream to compute percentile on the entire data distribution.

This task will add distribution support to FastForwardHttpReporter reporter.

DoD:
FastForwardHttpReporter should be able to report distribution metrics.

Dependencies:
1. Distribution support in JSON Metric Model

[ao2017]

Hey @samfadrigalan , I will handle this since you are tie up on testing.