contrib/envoyproxy: envoy external processing support #3220

Job	Run time
Prepare Go modules cache	42s
Smoke Tests	0s
macos-latest (AppSec disabled)	1m 41s
macos-12 go1.23	4m 47s
windows-latest (AppSec disabled)	2m 53s
macos-12 go1.22	5m 46s
ubuntu-latest-16-cores (AppSec disabled)	1m 18s
linux/amd64 golang:1.23-bookworm	1m 23s
macos-14 go1.23	2m 42s
linux/arm64 golang:1.23-bookworm	2m 40s
macos-14 go1.22	3m 41s
linux/amd64 golang:1.23-bullseye	1m 20s
linux/arm64 golang:1.23-bullseye	3m 0s
linux/amd64 golang:1.23-alpine	1m 24s
linux/arm64 golang:1.23-alpine	2m 58s
linux/amd64 golang:1.22-bookworm	1m 24s
linux/arm64 golang:1.22-bookworm	2m 47s
linux/amd64 golang:1.22-bullseye	1m 24s
linux/arm64 golang:1.22-bullseye	2m 51s
linux/amd64 golang:1.22-alpine	1m 21s
linux/arm64 golang:1.22-alpine	2m 43s
	48m 45s

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