fix: allow arbitrary operators with ANY and ALL on Postgres

[freshtonic]

In sqlparser PR #963 a check was introduced which limits which operators can be used with ANY and ALL expressions.

Postgres can parse more (possibly all binary operators, investigation pending) in this location. Postgres only seems to care that the operator yields a boolean - which is a semantic error, not a syntax (parse) error.

Example of semantic error in Postgres:

select 123 % ANY(array[246]);
ERROR:  op ANY/ALL (array) requires operator to yield boolean
LINE 1: select 123 % ANY(array[246]);
                   ^

FWIW, the Postgres pg_trgm extension provides support for the % where left and right args are text and it returns a boolean - which makes it useable with ANY and ALL.

The following code in src/parser/mod.rs:2893-2908 is where the allowlist of operators is enforced:

if !matches!(
    op,
    BinaryOperator::Gt
        | BinaryOperator::Lt
        | BinaryOperator::GtEq
        | BinaryOperator::LtEq
        | BinaryOperator::Eq
        | BinaryOperator::NotEq
) {
    return parser_err!(
        format!(
        "Expected one of [=, >, <, =>, =<, !=] as comparison operator, found: {op}"
    ),
        tok.span.start
    );
};