[Feature] More Functional Test Scenarios

### Feature Description (功能描述)

Do we have specific plans for various functional tests?

I think here are several scenarios in which we can add test cases for hstore:

- [ ] 1. Transfer leader
- [ ] 2. Split, merge region
- [ ] 3. Read, write, delete data
- [ ] 4. Backup, restore
- [ ] 5. Stop all nodes and restart all nodes
- [ ] 6. Restart all or part of the components repeatedly
- [ ] 7. Constantly scaling up and down the number of nodes.

For these scenarios, we need to check the following items:

1. There is no service that is irrecoverable
2. Data consistency
3. Data accuracy
4. Whether the result of each operation meets expectations