support pulsar packages when creating/updating functions

[jiangpengcheng]

❯ bin/pulsarctl functions update --tenant public --namespace default --name myfuncv2 --go "function://public/default/myfunction@2.0" --inputs persistent://public/default/test
error: open function://public/default/myfunction@2.0: no such file or directory
[✖]  open function://public/default/myfunction@2.0: no such file or directory