fix(libsinsp): allow reading scap from stdin #7345

Job	Run time
build-libs-emscripten 🧐	5m 52s
build-libs-linux-amd64 😁 (system_deps)	7m 22s
build-libs-linux-amd64 😁 (bundled_deps)	16m 58s
build-libs-linux-amd64-static 🎃	23m 6s
build-libs-linux-amd64 😁 (system_deps_minimal)	5m 21s
build-libs-linux-amd64 😁 (sanitizers)	16m 5s
build-libs-others-amd64 😨 (windows-latest, MultiThreaded)	5m 55s
build-shared-libs-linux-amd64 🧐	5m 39s
build-libs-others-amd64 😨 (windows-latest, MultiThreadedDLL)	5m 54s
build-libs-linux-amd64 😁 (zig)	26m 44s
build-libs-others-amd64 😨 (macos-latest)	2m 48s
build-libs-linux-arm64 😁 (system_deps)	5m 2s
build-shared-libs-macos-amd64 😨	1m 13s
build-libs-linux-arm64 😁 (bundled_deps)	11m 53s
run-e2e-tests-amd64 (system_deps)	9m 19s
build-libs-linux-arm64 😁 (system_deps_minimal)	3m 58s
run-e2e-tests-amd64 (bundled_deps)	19m 6s
run-e2e-tests-amd64 (asan)	21m 0s
test-libs-static (bundled_deps)	14m 36s
build-libs-linux-arm64 😁 (sanitizers)	11m 39s
build-libs-linux-arm64 😁 (zig)	16m 21s
	3h 55m 51s

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