Implement what-if functionality for Windows service operation#1507

Gijsreyn wants to merge 3 commits intoPowerShell:mainPowerShell/DSC:mainfrom

Gijsreyn:gh-1506/main/add-whatif-winserviceGijsreyn/operation-methods:gh-1506/main/add-whatif-winserviceCopy head branch name to clipboard