dym sdk: add network filter sdk for golang/cpp#44678

wbpcode wants to merge 2 commits intoenvoyproxy:mainenvoyproxy/envoy:mainfrom

wbpcode:dev-add-network-filter-support-to-go-cppwbpcode/envoy:dev-add-network-filter-support-to-go-cppCopy head branch name to clipboard