* New keywords:
* List Groups
* Delete Groups
* Describe Groups
* New consumer group states can be accessed with global vars (see https://github.com/robooo/robotframework-ConfluentKafkaLibrary/blob/master/src/ConfluentKafkaLibrary/__init__.py#L92)
* Threaded consumer can be now closed correctly
* Many admin client keywords now returns full response
* Update of testing env + github actions
* Minor improvements & bugfixes