Changes to List document group memberships

added the optional property data/groups/items/color to the response with the 200 status

added the optional property data/groups/items/icon to the response with the 200 status

the response property data/groupMemberships/items/collectionId became nullable for the status 200

added the optional property data/groupMemberships/items/documentId to the response with the 200 status

added the optional property data/groupMemberships/items/sourceId to the response with the 200 status

added the optional property data/groups/items/description to the response with the 200 status

added the optional property data/groups/items/disableMentions to the response with the 200 status

added the optional property data/groups/items/externalGroup to the response with the 200 status

added the optional property data/groups/items/externalId to the response with the 200 status

endpoint added