CDX-239 Update item groups endpoints to use v2#88

TarekAlQaddy wants to merge 3 commits intomasterConstructor-io/constructorio-python:masterfrom

cdx-239-python-client-library-update-item-groups-endpoints-to-use-v2Constructor-io/constructorio-python:cdx-239-python-client-library-update-item-groups-endpoints-to-use-v2Copy head branch name to clipboard