Allow passing options to Highcharts.setOptions()

[soroush-op]

This way, we would be able to set options such as lang.thousandsSep option in Highcharts (The default thousandsSep is space character.) Currently, the only way to set such options is to call Highcharts.setOptions() directly and not through Easychart:

Highcharts.setOptions({
  lang: {
    thousandsSep: ','
   }
  });

This is related to How to pass options to Highcharts.setOptions() issue for Drupal Easychart module.