Support new envoy wildcard flows in go-control-plane

[valerian-roche]

Envoy 1.21.0 brought a new wildcard definition (itself related to odcds)
While it seems that envoy will not use this new model out of odcds for now, the go-control-plane should support it as there is no strong commitment in the xds protocol, and to allow users to use odcds

A few specific considerations:

• a stream can now define subscribing to wildcard by sending "*" instead of nothing
• a stream can now subscribe or unsubscribe from wildcard while still referencing resources, and it expects the control-plane to keep track of explicitly subscribed resources
• when unsubscribing from a specific resource while using a wildcard subscription, envoy expects the control-plane to return the state of such resource

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged "help wanted" or "no stalebot" or other activity occurs. Thank you for your contributions.

[github-actions]

This issue has been automatically closed because it has not had activity in the last 37 days. If this issue is still valid, please ping a maintainer and ask them to label it as "help wanted" or "no stalebot". Thank you for your contributions.