Cross namespace secrets and config mounts

[raffis]

Is your feature request related to a problem? Please describe

Currently its required to create two secrets if it is required in two namespaces.

Describe the solution you'd like

I'd like to import a secret or an upcoming config from another namespace.

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.