Do not allow br full restore if table structure exists

## Feature Request

**Is your feature request related to a problem? Please describe:**

Currently, when trying to br restore a table after run query "delete from t1;" and "truncate table t1;" is different:

```
CREATE TABLE `t1` (`a` int(11) NOT NULL, PRIMARY KEY (`a`));
insert into t1 values (1), (2);
br backup t1;
delete from t1;
restore t1 => BR:Restore:ErrRestoreChecksumMismatch
```
```
CREATE TABLE `t1` (`a` int(11) NOT NULL, PRIMARY KEY (`a`));
insert into t1 values (1), (2);
br backup t1;
truncate table t1;
restore t1 => Success
```

**Describe the feature you'd like:**

After execute query "delete from t1;" or "truncate table t1; br restore should not allow user to restore to the table t1, as table structure still exists in this cases.

**Describe alternatives you've considered:**

**Teachability, Documentation, Adoption, Migration Strategy:**