support dump plan replayer for prepare stmt

## Enhancement
plan replayer is a very important tool to help locate plan problems.
But it doesn't support dump prepare stmt, for example:
```
prepare stmt1 from 'select xxx';
set @var1 = 100;
-- for now, we'are unable to dump this plan replayer of the following stmt.
execute stmt1 using @var1;
```

We can support like the following:
```
plan replayer dump execute stmt1 using @var1;
```