contrib/envoyproxy: envoy external processing support #3283

Job	Run time
Prepare Go modules cache	11s
Smoke Tests	0s
macos-latest (AppSec disabled)	2m 16s
windows-latest (AppSec disabled)	3m 10s
linux/amd64 golang:1.23-bookworm	1m 33s
ubuntu-latest-16-cores (AppSec disabled)	1m 33s
linux/arm64 golang:1.23-bookworm	3m 16s
linux/amd64 golang:1.23-bullseye	1m 22s
macos-12 go1.23	4m 56s
linux/arm64 golang:1.23-bullseye	3m 5s
linux/amd64 golang:1.23-alpine	1m 22s
macos-12 go1.22	5m 32s
linux/arm64 golang:1.23-alpine	3m 9s
macos-14 go1.23	3m 24s
linux/amd64 golang:1.22-bookworm	1m 33s
macos-14 go1.22	3m 42s
linux/arm64 golang:1.22-bookworm	3m 22s
linux/amd64 golang:1.22-bullseye	1m 21s
linux/arm64 golang:1.22-bullseye	3m 21s
linux/amd64 golang:1.22-alpine	1m 29s
linux/arm64 golang:1.22-alpine	2m 59s
	52m 36s

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