feature: add traffic(from cloud to edge) collector metrics for yurthub #398
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What type of PR is this?
/kind feature
What this PR does / why we need it:
Add traffic metrics in order to collect the traffic statics from cloud to edge, so we can easily determine which component consumes the most traffic for which type of request.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Does this PR introduce a user-facing change?
other Note