function _handleAddTooltip(tooltipType) {
    let initString = getCurrentConfig();
    let tooltipInitString = tooltipConfigs[tooltipType].initString;

    initString = initString.concat(tooltipInitString);
    configEditor.setValue(prettifyInitString(initString));
    setNewChart();
}
Adds tooltip code to the editor
@param  {string} tooltipType Constant from constant file