[FEATURE]: Multiple union / unionAll

### Describe what you want

Currently only 2 queries are corretly combined to a union.

When you add a third query, the first two are wrapped with () and all wrapped too, that doesn't work.

Example (current result of drizzle), when `unionAll(query1, query2, query3)`

```
(
(
SELECT ...
)
UNION ALL
(
SELECT ...
)
)
UNION ALL
(
SELECT ...
)
```