Is your feature request related to a problem? Please describe.

In some cases, e.g. long-running tests, it'd be useful to know how long a task has already been running.

Describe the solution you'd like

An option of gum --spin that switches on display of expired time:

⣽  Running ... [3s]
⣽  Running ... [4s]
#...
⣽  Running ... [1:15m]
⣽  Running ... [1:16m]

Describe alternatives you've considered

None.