Add basic tests for kvrocks2redis

[tisonkun]

Search before asking

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

Motivation

So that we're sure that the fundamental functions of kvrocks2redis work well.

Solution

@git-hulk I'm still counting on you to understand how to use kvrocks2redis. So that we can add some gocase to cover those usages.

Are you willing to submit a PR?

• [ ] I'm willing to submit a PR!