Sperate the layer of redis kv encode from the underlay storage

### Search before asking

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

### Motivation

- Making the Redis encode layer as an independent library is good for other modules to use, it can accept Redis protocol and output encoded KV pairs.
- Other modules or programs can include the library and write to an abstract storage, it seems more inflexible.

### Solution

_No response_

### Are you willing to submit a PR?

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