WPB-6012 create new API version v6#3815

battermann merged 6 commits intodevelopwireapp/wire-server:developfrom

WPB-6012-backend-create-new-api-version-v-6-once-v-5-is-stablewireapp/wire-server:WPB-6012-backend-create-new-api-version-v-6-once-v-5-is-stableCopy head branch name to clipboard