kpt live destroy command should be able to wait for resources to be removed

[mortent]

The kpt live destroy command currently doesn't have parity with the kpt live apply command. In particular two pieces stand out:

• It doesn't allow the --prune-propagation-policy and --prune-timeout flags that allow users to specify whether we should wait for resources to be deleted, and if so, for how long.
• The Applier.Run function returns an init event on the channel with information about which resources will be applied/pruned. This is used by the table UI to be able to create the list of resources and their state before any changes are made. The Deployer should use a similar solution.