ClickHouse table function is recognized as TableFactor::Table

See https://clickhouse.com/docs/sql-reference/table-functions.

For example:
```sql
SELECT * FROM test;
SELECT * FROM test();
```

They produce:

> pre_visit_table_factor: Table { name: ObjectName([Identifier(Ident { value: "test", quote_style: None, span: Span(Location(1,16)..Location(1,20)) })]), alias: None, args: None, with_hints: [], version: None, with_ordinality: false, partitions: [], json_path: None, sample: None, index_hints: [] }

and

> pre_visit_table_factor: Table { name: ObjectName([Identifier(Ident { value: "test", quote_style: None, span: Span(Location(1,16)..Location(1,20)) })]), alias: None, args: Some(TableFunctionArgs { args: [], settings: None }), with_hints: [], version: None, with_ordinality: false, partitions: [], json_path: None, sample: None, index_hints: [] }

The second version produces `args: Some(TableFunctionArgs { args: [], settings: None })`.

As I see it's because [`Function`](https://github.com/apache/datafusion-sqlparser-rs/blob/b8539a52af7419b86d9c2fc51ba247d022f7a6f8/src/parser/mod.rs#L13498) is only recognized after a `LATERAL` keyword, and [`TableFunction`](https://github.com/apache/datafusion-sqlparser-rs/blob/b8539a52af7419b86d9c2fc51ba247d022f7a6f8/src/parser/mod.rs#L13511) is only for the `TABLE()` syntax (but not for `ident()`).

Inizia in src/parser/mod.rs, nella gestione di Function e TableFunction collegata nell’issue, quindi confronta il parsing di SELECT * FROM test e SELECT * FROM test(). Conferma il comportamento completato con un output del parser che distingua correttamente la forma ident() di ClickHouse da un semplice riferimento a una tabella.

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