@example
const buttonId = IITC.toolbox.addButton({
  label: 'AboutIITC',
  action: window.AboutIITC
});

@example
IITC.toolbox.addButton({
  id: 'mybtn',
  label: 'Test Button',
  action: () => alert('Clicked!')
});

@example
const buttonId = 'mybtn';
const isUpdated = IITC.toolbox.updateButton(buttonId, { label: 'Updated Button', action: () => console.log('New Action') });