Add func logs command #3521
Description
Functions should provide a built-in way to tail logs for a deployed
function. Currently users must know the underlying service name and
use kubectl/kn-service-log manually.
func logs should stream logs for the function in the current
directory (or by name), abstracting away the underlying service
and pod details.
Options to explore: wrapping kn-service-log, embedding stern, or
a lightweight implementation using the Kubernetes logs API directly.
Related: SRVOCF-370