Reorganize permissions example.
Permissions for optional features are separated from those that are mandatory.
Revised the list of permissions. Added and removed features to make it fit what Mizu currently requires.
* Use "mizu" namespace instead of "default". Create and delete as necessary.
* Wait until namespace is deleted.
* Distinguish between timeout and other errors.
* Sorted consts.
* k8s provider gets the names of Mizu serviceaccount, clusterrole and clusterrolebindings from caller.
* Renames.
* Remove non-namespaced mizu resources when finished: clusterrole and clusterrolebindings.
* Don't wait for namespace deletion if it was already deleted.
* When watching pods, check for cancellation before reading from channels.
* Allow user to cancel resource deletion and to cancel the wait.
* Increased cleanup timeout.
* go mod tidy.
* Ignore cli build products.
* Print err.
* Don't delete clusterrole and clusterrolebinding if we do not have permissions.
* Added roles list in README.
* Added clusterrole and clusterrolebindings examples.
