GroupId should be allowed to be configurable and not being forced to create a random group each time a consumer runs

[ryan-smylski]

We release updates to our applications on a weekly basis, and with the forced random group id each time an application is deployed, we now have hundreds of unused consumer groups. It would be great to allow configuration to manage the groupId and not be forced to use random groupIds.

Thank you

[tomasAlabes]

PRs welcomed :)