[bug]: Ignore comments in CQL in enhanced console

[millerjp]

It is common to add comments to CQL which can get picked up when pasting in CQL. We need to ignore these.

Eg

-- Product inventory table
CREATE TABLE products (
    product_id uuid,
    name text,
    price decimal,
    stock int,
    last_updated timestamp,
    PRIMARY KEY (product_id)
);

-- This is a single-line comment

SELECT * FROM cycling.route; -- End of line comment

// This is also a single-line comment

SELECT * FROM cycling.route; // End of line comment

And handle multi line comments

/*
This is the first line of a comment that spans multiple lines
*/
SELECT * FROM cycling.route;