title: Showing progress in Google scripts
body: <p>I want to show progress of a lengthy script to the user. Ideally I want to use the yellow toast that comes up saying <code>running script cancel dismiss</code> when running a Google script</p>
  
  <p>I know u can throw custom error but how can throw custom messages to this yellow box.</p>
  
  <p>Or another alternative will do as well. Not msgbox as that stops the script.</p>