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>

examples/cli.rs

@@ -43,6 +43,7 @@ $ cargo run --feature json_example --example cli FILENAME.sql [--dialectname]
         "--mysql" => Box::new(MySqlDialect {}),
         "--snowflake" => Box::new(SnowflakeDialect {}),
         "--hive" => Box::new(HiveDialect {}),
+        "--redshift" => Box::new(RedshiftSqlDialect {}),
         "--generic" | "" => Box::new(GenericDialect {}),
         s => panic!("Unexpected parameter: {}", s),
     };