This is new command that can be used to delete everything running in a
cluster related to an application using the labels we use.
This currently uses a hardcoded set of resource types. It would be
possible to make this generic, which might become needed in the future.
See comments in the code.
---
The overall design for how to use the command:
```sh
tye undeploy
```
Will read a solution or tye.yaml to get the application name. It then
enumerates and deletes all resources in the cluster with
`app.kubernetes.io/part-of=application-name` (in the current namespace).
```sh
tye undeploy --what-if
```
Will do the same, but without actually doing the deletion.
```sh
tye undeploy -i
```
Will interactively give you a yes/no choice for whether to delete each
resource.
Ryan Nowak