Execution timer for `shell` tool

### Describe the feature or problem you'd like to solve

Lack of information for how long a shell job has been running

### Proposed solution

The shell tool should give a timer of how many seconds that a command has been running for.

### Example prompts or workflows

Login to a system, check counts for X every 5s for 15s.

### Additional context

This is really useful in scenarios where you want to know how long has it been going for, so that means you know when its hits 15s the work is about to be over rather than a blind wait.