Refactor kvrocks2redis via rocksdb secondary instance

[maochongxin]

Using RSI (Secondary Instance) for synchronization, replacing the previous method of using OpenForReadOnly followed by PSync.
First, open the data directory using OpenAsSecondary, and reuse the previous method of parsing the checkpoint to complete a "full sync". Then, use TryCatchUpWithPrimary to synchronize the new wal.

Try to fix #1832

[maochongxin]

I'm still trying to add some integration tests

[tisonkun]

Thanks for your contribution @maochongxin!

The PR description is empty. Can you add some background so that reviewers can understand the motivation and how you plan to implement it?

[maochongxin]

Thanks for your contribution @maochongxin!

The PR description is empty. Can you add some background so that reviewers can understand the motivation and how you plan to implement it?

Thank you for the reminder. I have now provided the background information for this matter.

[PragmaTwice]

The rest looks good to me! It would be great if you can add some test for it.

[maochongxin]

The rest looks good to me! It would be great if you can add some test for it.

Added test for data consistency between the source and destination nodes.

[PragmaTwice]

The rest looks good to me! It would be great if you can add some test for it.

Added test for data consistency between the source and destination nodes.

Great! Could you also add tests for the incremental data? e.g. kvrocks2redis can catch new data after starting if it is written to the source kvrocks node.

[PragmaTwice]

We need to add apache license header to newly added files.

ERROR the following files don't have a valid license header: 
utils/kvrocks2redis/tests/check_consistency.py 

Refer to x.py for the same header.

[maochongxin]

We need to add apache license header to newly added files.

ERROR the following files don't have a valid license header: 
utils/kvrocks2redis/tests/check_consistency.py 

Refer to x.py for the same header.

Thank you, updated.

[sonarcloud]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

5 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[PragmaTwice]

Thank you for your contribution!