provide namespaced installation manifests

[Bobgy]

Right now, we only provide cluster scoped installation manifests.
Providing namespace installation manifests help improve permission separation when namespace owners install paddle-operator.

[Bobgy]

Just logging an idea, please evaluate based on user request

[kuizhiqing]

Actually, the default manifests go with namespaced installation under namespace paddle-system, user should remove this constraints or replace it with other ns manually for cluster scoped installation.

[Bobgy]

I guess I was mislead by the ClusterRole and ClusterRoleBinding in the manifests. Are there any reasons to use them?