new(userspace/libsinsp): support plugins in sinsp-example. #1940

Job	Run time
build-test-e2e-amd64 😇 (bundled_deps)	13m 33s
build-test-e2e-arm64 😇 (bundled_deps)	29m 25s
test-e2e-amd64-kmod 😇 (bundled_deps)	9m 1s
test-e2e-amd64-bpf 😇 (bundled_deps)	10m 52s
test-e2e-amd64-modern-bpf 😇 (bundled_deps)	10m 51s
test-e2e-arm64-kmod 😇 (bundled_deps)	20m 41s
test-e2e-arm64-bpf 😇 (bundled_deps)	16m 58s
test-e2e-arm64-modern-bpf 😇 (bundled_deps)	6h 0m 12s
	7h 51m 33s

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