fix: remove NewConsumerFromClient method call in newConsumerGroup method

[Lumotheninja]

fix the issue of consumergroup not closing properly when calling consumergroup.close()

currently, the NewConsumerGroup method calls the NewConsumerFromClient method which creates a nopclient, and thus this client cannot be closed properly

[dnwe]

@Lumotheninja thanks for catching this problem, see query above.

Also, please could you also fix your author settings in gitconfig to have a name and e-mail address matching your GitHub username and then sign the CLA to have your PR reviewed.

[Lumotheninja]

@Lumotheninja thanks for catching this problem, see query above.

Also, please could you also fix your author settings in gitconfig to have a name and e-mail address matching your GitHub username and then sign the CLA to have your PR reviewed.

Hi @dnwe sorry this is my first time contributing to Sarama, I have signed the CLA as well as added my email to the last commit, is that sufficient?

[Lumotheninja]

I think I am unable to change the email of past commiters, let me open a new PR

please see #2424