[Tech Request]: implement new log entry with more reserved metadata space in the header

### Is there an existing issue for the same tech request?

- [X] I have checked the existing issues.

### Does this tech request not affect user experience?

- [X] This tech request doesn't affect user experience.

### What would you like to be added ?

```Markdown
Design the new log entry with more header space to support further optimization for log entry consumption.
Compatible with the previous version
```

### Why is this needed ?

For example, we can add an indicator bit in the log entry header to specify whether it contains any new s3 file. with this indicator, it will save a lot of resources in the master-backup data synchronization scenarios

### Additional information

_No response_