[#583][Delta] Ensure resources are properly sent again if envoy unsubscribes then subscribes again to a resource

[valerian-roche]

This PR is part of the fix for https://github.com/envoyproxy/go-control-plane/issues/583 related to resources being unsubscribed from then subscribed to again This one applies to both simple and linear cache when using the delta protocol. Actionable cases would likely only impact delta-ADS as EDS outside of ADS does not share streams and will therefore usually not have multiple resources this way

The logger issue is related to sotw-ADS which is part of a followup PR This PR is built on top of https://github.com/envoyproxy/go-control-plane/pull/584 as the sotw part will be heavily relying on it

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[haoruolei]

is this work still active?

[valerian-roche]

This work builds on #584, which itself now depends on rolling back #615. Sadly graphite and branch stacking cannot be done across forks Alec has had few cycles recently to review, but when he becomes available I hope to have those move ahead