Allow a wireguardPeer to wireguardRef a server on a different namespace

[Tombar]

Is your feature request related to a problem? Please describe.
AFAIU i cant create a wireguardPeer A on namespace A and wireguardRef a wireguardServer on namespace B

this makes it hard to share wireguardPeer secret between namespces

Describe the solution you'd like
Allow for wireguardRef to reference a wireguardServer with either dot notation like k8s services or with a namespace field

Describe alternatives you've considered
Check CRD and operator code for options, didn't find any way to my understanding

Additional context
this project rocks!