Skaffold should support pre/post lifecycle hooks for `Cleanup`

Issue tracks feature request for skaffold supporting pre/post lifecycle hooks for `Cleanup` step/phase. This way users could add custom cleanup code as necessary to extend/modify what skaffold does. This would likely involve adding similar UX/functionality to [Skaffold's lifecycle pre/post hooks](https://skaffold.dev/docs/pipeline-stages/lifecycle-hooks/) only extended to the `Cleanup` phase (also would require exposing a `Cleanup` phase) to allow for this