[feature] hey stop should ask which timer when multiple are running

[masukomi]

currently saying hey stop will stop the most recently started timer. This is problematic if you have automations starting timers and unclear when you didn't realize you had multiple running.

request:

1. when run without a timer id, hey stop should check if there are multiple timers running
2. it should display the currently running timers if there are more than one.
3. it should allow you to enter the one you want to stop, and then apply your original command. So, hey stop at 3:00 would ask you for an ID and then be invoked as if you ran hey stop <id> at 3:00