Synchronization of slowlog and perflog

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/incubator-kvrocks/issues) and found no similar issues.

### Motivation

As discussed on the KVRocks slack channel,
It would be beneficial for performance debugging to force the two tools (`slowlog` and `perflog`) to sample the same commands and synchronize them on both perflog's and slowlog's lists.

### Solution

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

No files or tests are named. Start by locating the C++ implementations and command-sampling paths for slowlog and perflog, then review any related tests. Done should mean both tools sample the same commands and show synchronized entries in both lists.

Written by the indexing model from the issue text.