new(userspace/libsinsp): support plugins in sinsp-example. #7055

Job	Run time
build-libs-linux-amd64 😁 (system_deps)	6m 57s
build-libs-linux-amd64 😁 (bundled_deps)	16m 40s
build-libs-linux-amd64 😁 (system_deps_minimal)	5m 1s
build-libs-linux-amd64 😁 (sanitizers)	14m 55s
build-libs-linux-amd64-static 🎃	22m 45s
build-libs-linux-amd64 😁 (zig)	22m 49s
build-libs-linux-arm64 😁 (system_deps)	10m 53s
build-libs-others-amd64 😨 (windows-latest, MultiThreaded)	5m 57s
build-libs-linux-arm64 😁 (bundled_deps)	21m 38s
build-shared-libs-linux-amd64 🧐	5m 21s
build-libs-others-amd64 😨 (windows-latest, MultiThreadedDLL)	5m 58s
build-libs-linux-arm64 😁 (system_deps_minimal)	8m 50s
build-libs-others-amd64 😨 (macos-latest)	2m 47s
build-libs-linux-arm64 😁 (sanitizers)	21m 37s
build-libs-linux-arm64 😁 (zig)	21m 34s
build-libs-emscripten 🧐	5m 6s
build-shared-libs-macos-amd64 😨	1m 5s
run-e2e-tests-amd64 (system_deps)	9m 6s
test-libs-static (bundled_deps)	13m 41s
run-e2e-tests-amd64 (bundled_deps)	18m 36s
run-e2e-tests-amd64 (asan)	20m 15s
	4h 21m 31s

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