fix(web): align step markers with thumb position using thumbSize prop#751

BartoszKlonowski merged 7 commits intocallstack:maincallstack/react-native-slider:mainfrom

mikolajwilczek:fix/743-web-step-marker-alignmentmikolajwilczek/react-native-slider:fix/743-web-step-marker-alignmentCopy head branch name to clipboard