Refactor the data migration code
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enhancement
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- C++
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Description
### Search before asking
- [X] I had searched in the [issues](https://github.com/apache/kvrocks/issues) and found no similar issues.
### Motivation
Now that we have support for `DBIterator` and `WALIterator`, we can refactor migration code based on redis-command using these two classes. Also, now that we support two different migration types, we can make the code base about migration a bit cleaner than it is now.
The unit tests could also be clearer.
### Solution
_No response_
### Are you willing to submit a PR?
- [ ] I'm willing to submit a PR!
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