Timer or Stopwatch widget

### Description

I know there already is a `clock` widget, but the only downside of it is that I'm only being able to view the timezone of cities right now, it would be nice if this widget could be further integrated with a timer or a stopwatch.

The timer can either a standalone widget, like `stopwatch` or `timer`, with the following configuration:

```yml
- type: timer
hour-format: 24h
default-timer:
- title: Task A
time: 20m
- timezone: Task B
label: 1h
- timezone: Task C
label: 1s

- type: stopwatch
hour-format: 24h
```