Refactor the selinux crate #2359

Job	Run time
youki-build (x86_64, gnu)	1m 41s
youki-build (x86_64, musl)	1m 52s
youki-build (aarch64, gnu)	1m 54s
youki-build (aarch64, musl)	1m 59s
oci-validation-rust (x86_64, gnu)	2m 42s
containerd-integration-tests (x86_64, gnu)	4m 40s
k8s-tests (x86_64, gnu)	1m 45s
oci-validation-rust (x86_64, musl)	2m 36s
oci-validation-go (x86_64, gnu)	1m 59s
k8s-tests (x86_64, musl)	1m 34s
containerd-integration-tests (x86_64, musl)	4m 45s
oci-validation-go (x86_64, musl)	2m 17s
rootless-podman-test (x86_64, gnu)	40s
docker-in-docker (ubuntu-22.04)	5s
rootless-podman-test (x86_64, musl)	1m 6s
docker-in-docker (ubuntu-20.04)	8s
	31m 43s

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