Add Redshift dialect, handle square brackets properly (#471)

* Redshift square bracket handling

We need to detect `[` or `"` for Redshift quotes around indentifier and at the same time exclude
treating JSON paths as indentifer

* RedshiftSqlDialect documentation update

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Renamed _chars to chars

* Fixed warnings

* Missing license

Co-authored-by: Maciej Skrzypkowski <maciej.skrzypkowski@satoricyber.com>
Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

src/test_utils.rs

@@ -141,6 +141,7 @@ pub fn all_dialects() -> TestedDialects {
             Box::new(AnsiDialect {}),
             Box::new(SnowflakeDialect {}),
             Box::new(HiveDialect {}),
+            Box::new(RedshiftSqlDialect {}),
         ],
     }
 }