formatting the AST while preserving the source location information from the original query

In the current sqlparser, parsing

```sql
select
a,
b
from
t
```

and then fromatting it back to a string results in

```sql
select a,b from t
```

Since sqlparser v0.53, we have the source location information inside the AST, which theoretically makes it possible to reconstruct the original query formatting (or at least getting very close to it).

I know this is a huge undertaking, but it would be really useful. For instance, in [sqlpage](https://github.com/lovasoa/SQLpage), I would love being able to respect the initial user formatting of queries, in order for database errors that contain source position information to be meaningful and not confusing.

I'm opening this issue to start discussing this with the community (and especially with you @iffyio and @alamb :wink: ).

Am I the only one interested in this ? What would be the best approach to implementing this ?

Non sono indicati file o test specifici. Inizia esaminando il supporto alle posizioni nel sorgente dell’AST introdotto in sqlparser v0.53 e il percorso di formattazione esistente; il lavoro è completato quando la formattazione della query originale può essere ricostruita con una precisione sufficiente a mantenere significative le posizioni nel sorgente.

Scritto dal modello di indicizzazione a partire dal testo della issue.