[CLI] Add a destroy app command

[mirkoCrobu]

Motivation

closes #105

We could add a new app destroycommand (or a similar name) for stopping and removing all the data of an app.
In particular, we should do a docker-compose down and remove the .cache.

We should also consider adding a destroyed (or a better name) that is the default state of an app if it has not been run yet.
With this additional state, we would then be able to always return a state when listing the apps (right now apps and examples that have not been run, will show up as with no state).

Change description

Additional Notes

Reviewer checklist

• PR addresses a single concern.
• PR title and description are properly filled.
• Changes will be merged in main.
• Changes are covered by tests.
• Logging is meaningful in case of troubleshooting.

[lucarin91]

I would probably just add the cleanup in this function

for msg := range cleanAppCacheFiles(app) {
			if !yield(msg) {
				return
			}
		}

[lucarin91]

this seems redundant, isn't just what the StopAndDestroyApp does?

[mirkoCrobu]

Yes, it behaves the same, except that stopAndDestroyApp only has an effect if the app is starting or running.
I just need to make sure that removing the status check won’t break anything before merging the two funcs.
Or maybe we can keep the status check on stopAndDestroyApp, and just add the cleanAppCacheFiles .

if appStatus.Status != StatusStarting && appStatus.Status != StatusRunning {
				yield(StreamMessage{data: fmt.Sprintf("app %q is not running", app.Name)})
				return
			}

[mirkoCrobu]

Add uninitialized status and set status information for app list