[ENH] Allow more filters to be pushed down to table scan

[andygrove]

Is your feature request related to a problem? Please describe.

We currently only push down IS NOT NULL filters to table scan:

fn is_supported_push_down_expr(expr: &Expr) -> bool {
    match expr {
        // for now, we just attempt to push down simple IS NOT NULL filters on columns
        Expr::IsNotNull(ref a) => matches!(a.as_ref(), Expr::Column(_)),
        _ => false,
    }
}

Describe the solution you'd like Push down more filters.

Describe alternatives you've considered None

Additional context None