Changes to List groups

the response property groups/items/user_count became optional for the status 200

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

the response's body minItems was decreased from 1 to 0

the response's body type changed from array to no type for status 200

api operation id listGroups was added

added the required property extras to the response with the 200 status

added the required property groups to the response with the 200 status

added the required property load_more_groups to the response with the 200 status

added the required property total_rows_groups to the response with the 200 status