Add more tests for stream consumer group

[Yangsx-1]

Search before asking

• [X] I had searched in the issues and found no similar issues.

Motivation

We should add more test cases for stream consumer group, especially for the time related information such as idle time and inactive time, and other information in XINFO command.

Solution

No response

Are you willing to submit a PR?

• [ ] I'm willing to submit a PR!