Feature request: INSERT SELECT support

Hello,

It will be great to be able run INSERT SELECT queries like:
```
$select = $fpdo->from('table1')->select(['id', 'name', 'date'], true)->where('some',  'any');
$fpdo->insertInto('table2')->values($select, ['t_id', 't_name', 't_date'])
```
And get
`INSERT INTO table2 ('t_id', 't_name', 't_date') SELECT id, name, date FROM table1 WHERE some = ?`