feat: eventshub sender can send to resources in other namespaces

[Cali0707]

Changes

• Add a new k8s NamespacedAddress function to return an address in a different namespace than env
• Add some eventshub options to send to resources in other namespaces

Release Note

Eventshub senders can deliver to resources in other namespaces

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707

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[Cali0707]

/cc @creydr @pierDipi @yijie-04

This should help with fixing the cross namespace e2e test PR in eventing core

[Cali0707]

/cc @pierDipi

[pierDipi]

/lgtm