implement getuserSyncs#23

ym-aaron wants to merge 4 commits intomasteryieldmo/Prebid.js:masterfrom

feature/FS-10320-Update-Prebid.js-Adapter-to-perform-user-synchronizationyieldmo/Prebid.js:feature/FS-10320-Update-Prebid.js-Adapter-to-perform-user-synchronizationCopy head branch name to clipboard