Re-add Stop to provider interface and differentiate stop & delete

[richardcase]

Describe the solution you'd like:
With #329 we removed Stop from the Microvm provider interface and form the firecracker implementation as stop isn't used (we currently take action in delete).

We should add Stop back in and update flintlock so that the following happens:

• Stop stops the microvm from running (i.e. stops firecracker procvess)
• Delete deletes any files/resources that where created my the provider implementation. So for Firecracker it will be things like firecracker.cfg & metdata.json

Why do you want this feature:

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

[github-actions]

This issue is stale because it has been open 60 days with no activity.

[github-actions]

This issue is stale because it has been open 60 days with no activity.

[aryan9600]

@richardcase After going through what the delete plan looks like atm and the proposal in this issue, I think we should

• get rid of runtime.deleteDirectory and shift its logic to fcProvider.Delete().
• shift the current logic in fcProvider.Delete() to fcProvider.Stop().

Then update the deletion plan to replace

• the step which uses fcProvider.Delete() with a step which uses fcProvider.Stop()
• the step which uses runtime.deleteDirectory with a step uses fcProvider.Delete()

[github-actions]

This issue is stale because it has been open 60 days with no activity.