Migrate GET groups

This endpoint has been retained, with some changes.

	Endpoint	Response
Current	GET `/api/2/groups`	List of 2.0 Group objects
Target	GET `/api/2.1.1/groups`	2.1.1 Groups

The 2.1.1 endpoint adds various query parameters:

query – a text filter on the name of the groups
permission – filters groups for which the caller has a certain group permission (VIEW or MANAGE)
resultSize and resultFrom – pagination parameters

The response has a different structure: it’s always paginated and the group information has been expanded.