Add `shallowMerge` function#1274

Gijsreyn wants to merge 6 commits intoPowerShell:mainPowerShell/DSC:mainfrom

Gijsreyn:gh-57/main/add-shallowmerge-functionGijsreyn/operation-methods:gh-57/main/add-shallowmerge-functionCopy head branch name to clipboard