Aggregated VOQ counters

[zhangyanzhao]

[kenneth-arista]

HLD for review: #1587

[kenneth-arista]

See HLD (#1587) for PR references.

[kenneth-arista]

@zhangyanzhao, let's punt this feature from 202405. Feedback from the first HLD review necessitated a significant rewrite, which have been prototype internally, and initial PRs have also been floated for review. However, given the current date, it is not realistic to have this feature complete for 202405. We will aim to have it ready for the next release.