Add support for waiting on a StatefulSet.
SUMMARY
This PR implements support for waiting on StatefulSet for readiness similar to how the other waiters currently work.
ISSUE TYPE
Feature Pull Request
ADDITIONAL INFORMATION
This was designed to (mostly) mimic the behaviour of the StatefulSetStatusViewer used by kubectl rollout status -w.
Reviewed-by: Abhijeet Kasurde <None>
Reviewed-by: Joshua K <None>
Reviewed-by: None <None>
Reviewed-by: Mike Graves <mgraves@redhat.com>
Reviewed-by: None <None>
