cleanup(sinsp): move engine/platform selection code to libsinsp #4208

Job	Run time
build-libs-linux-amd64-asan 🧐	15m 7s
build-libs-linux-amd64 😁 (system_deps)	12m 16s
build-libs-linux-amd64-static 🎃	36m 51s
build-libs-linux-amd64 😁 (bundled_deps)	33m 34s
build-shared-libs-linux-amd64 🧐	6m 33s
paths-filter	5s
build-libs-linux-amd64 😁 (system_deps_w_chisels)	9m 50s
build-libs-emscripten 🧐	8m 39s
build-libs-linux-amd64 😁 (system_deps_minimal)	6m 59s
build-shared-libs-macos-amd64 😨	6m 6s
build-libs-others-amd64 😨 (windows-latest)	11m 15s
run-e2e-tests-amd64 (system_deps)	12m 9s
test-libs-static (bundled_deps)	26m 40s
build-libs-others-amd64 😨 (macos-latest)	13m 24s
run-e2e-tests-amd64 (bundled_deps)	30m 36s
run-e2e-tests-amd64 (system_deps_w_chisels)	12m 58s
run-e2e-tests-amd64 (asan)	34m 5s
test-drivers-x86 😇 (bundled_deps)	17m 5s
test-scap-x86 😆 (bundled_deps)	11m 5s
build-libs-s390x 😁 (system_deps)	2h 30m 31s
	7h 35m 48s

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