Timeout for tests

> Do you plan to implement timeout in tests?
> 
> I want to abort when a test does not finish within a specified time-limit.
> Like the phpunit option `--default-time-limit`.
> 
> ```
> ex)
> shellspec --default-time-limit=1
> ```
> 
> Let me know if there is a better way.
> 
> 

_Originally posted by @dkzkb in https://github.com/shellspec/shellspec/discussions/209_