New period customization for PerfectScale Public API for Workloads

Users could specify "period" query parameter to scope down time window for workloads and their cost analysis data

By aleksandr.k

PerfectScale Public API for Workloads now supports providing a custom query parameter "period" to select time window to scope source data and get precise cost analysis. This makes it as flexible as using PofFit page with time window selector.

We kept the backward compatibility and added new fields to represent period-scoped cost analysis data while keeping old fields to show data for 30-day period.

Updated API is described here: List all workloads in a specified cluster