Allow for step-by-step execution of tasks or commands (user interaction needed to proceed)

[pioio]

Debugging taskfiles can be tricky.
We should make it easier.

One way to do this would be to allow executing commands, and tasks, step by step (i.e. one by one), and requiring user interaction in between each step.

• ENTER proceeds to the next task/cmd
• ESC/ctrl+c aborts
• SPACE skips this cmd/task (e.g. to skip long-running task which we are not interested in)

The user should be able to choose whether they want to execute steps on per-cmd or per-task level.

This feature should be implemented as a command line flag at a minimum.

But there might be usecases for allowing to set "step-by-step-commands" on per-task basis. I.e. such tasks would run commands step-by-step by default. In this case, one could in principle combine (1) having only that specific task execute commands step by step, with (2) adding a command line flag to execute all tasks on step-by-step basis on the per-task level.