Expose a clock_in function in the notifier tasks

### Does this feature exist in Emacs orgmode core?

No

### Orgmode link

_No response_

### Feature value

I'm currently using the notifier to display the name of the scheduled task in a floating window, but I would like to clock in the task automatically.

If the tasks expose a `clock_in` method, it would be easy to hook it along with the floating window.

### Additional context

_No response_