Better estimation of first-line column numbers

[hildjj]

With the PR about to drop, line numbers will be correct from this code:

import peggy from "peggy-tag";

const parse123 = peggy`foo = $("f" "o"+)`;
console.log(parse123("foooo")); // "foooo"

but column numbers for errors thrown from the last line will be off by three. Find a way to determine where "foooo" actually starts.

[hildjj]

From discord discussion, to reproduce:

Error.prepareStackTrace = (_, s) => s;

function createFunc() {
  return () => {
    const sites = new Error().stack;
    console.log(sites[1].getColumnNumber());
    console.log(sites[1].getFunctionName());
  };
}

const parse123 = createFunc();
parse123();