[FR] Bastion tunnel inactivity timeout

### Describe the bug

When running `az network bastion tunnel` in the background (see eg https://github.com/konstruktoid/ansible-bastion-tunnels), the user needs to manually terminate the running threads.

Feature request: Add an inactivit timeout option that will terminate the thread if no data has been sent for X amount of seconds or minutes.

### Related command

`az network bastion tunnel`

### Errors

N/A

### Issue script & Debug output

N/A

### Expected behavior

Threads are terminated after a defined time of inactivity.

### Environment Summary

```
az --version
azure-cli 2.59.0

core 2.59.0
telemetry 1.1.0

Extensions:
bastion 0.3.0
ssh 2.0.3
bastion 0.3.1 (dev) # local code modifications
```

### Additional context

_No response_