Support exposing the Audience of an InMemoryChannel

[creydr]

As the Eventing OIDC feature track describes, Addressables (and thus InMemoryChannels) need to announce their audience in .status.address.audience in the format GROUP/KIND/NAMESPACE/NAME (e.g. messaging.knative.dev/inmemorychannel/myns/myimc).

In particular the IMC controller should:

• when the feature flag (see Add authentication.oidc feature flag #7174) is disabled:
  • no change in behavior
• when the feature flag (see Add authentication.oidc feature flag #7174) is enabled:
  • Set the InMemoryChannels .status.address.audience accordingly.

Additional Information:

• Requires Add Audience field in duckv1.Addressable pkg#2795
• Requires Add Audience field in CRDs #7189

[CodesbyUnnati]

/assign