Parsing fails for postgres queries with CTE's that use `MATERIALIZED` keyword

[ReppCodes]

Hi! I'm seeing parsing failures for Postgres queries that use the MATERIALIZED keyword.

Minimal repro in the format of a sqlparser-rs test:

#[test]
fn parse_mat_cte() {
    let sql = r#"WITH cte AS MATERIALIZED ( select id from accounts ) select id from cte;"#;
    pg().verified_stmt(sql);

    let sql2 = r#"WITH cte AS NOT MATERIALIZED ( select id from accounts ) select id from cte;"#;
    pg().verified_stmt(sql2);
}

I tested this on two versions, including the latest:

sqlparser = "0.43.1"
# sqlparser = "0.36.1"

[ReppCodes]

I've opened #1148 to address this issue.

[ReppCodes]

This has been resolved by #1148