An uninstall dry-run flag when uninstalling shared dependencies

[mattfarina]

When uninstalling shared dependencies (#166) it would be useful to have a dry-run option that would output the shared dependencies and ordering they would be uninstalled. This should be in both Go API and CLI command form (list, YAML, and JSON output).

[jiaqiluo]

my two cents here:
The hypper uninstall can have a confirmation step that lists out the resources to be deleted and prompts for yes/no. And of course, a --no-prompt or --force flag for skipping the confirmation.

(I have not looked at the code closely so please ignore if this is what hypper already has)