Support for OCI container labels / annotations

[mikehaller]

It would be great if container annotations / labels could be supported to some degree. Supporting container annotations would also allow the integration of additional functionality into the low level container runtime, such as custom runtimes like the WasmEdge runtime via crun.

References:

• OCI Container Annotations: https://github.com/opencontainers/image-spec/blob/main/annotations.md
• WASM Edge: https://wasmedge.org/docs/develop/deploy/kubernetes/kubernetes-containerd-crun/
• In Kubernetes: https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/