PITR multi-time-segment-restore support

## Enhancement
The issue records the PRs to support PITR multi-time-segment-restore feature. The feature allows users to restore log backup data over consecutive time periods. The following is a demonstration of the features:
```shell
# the first part of PITR restore, which requires specifying the path to the full backup
./br restore point -u -s --full-backup-storage --restored-ts

# the middle part of PITR restore, which requires specifying the start timestamp from the previous restore's restored timestamp.
./br restore point -u -s --start-ts --restored-ts

# the last part of PITR restore, which requires specifying the start timestamp from the previous restore's restored timestamp.
./br restore point -u -s --start-ts --restored-ts
```

Here are PR lists:
- [ ] TODO