Implement RuntimeConfig RPC

[saschagrunert]

kubernetes/kubernetes#118770 got merged which introduces a new RPC:

    // RuntimeConfig returns configuration information of the runtime.
    // A couple of notes:
    // - The RuntimeConfigRequest object is not to be confused with the contents of UpdateRuntimeConfigRequest.
    //   The former is for having runtime tell Kubelet what to do, the latter vice versa.
    // - It is the expectation of the Kubelet that these fields are static for the lifecycle of the Kubelet.
    //   The Kubelet will not re-request the RuntimeConfiguration after startup, and CRI implementations should
    //   avoid updating them without a full node reboot.
    rpc RuntimeConfig(RuntimeConfigRequest) returns (RuntimeConfigResponse) {}

CRI-O should be able to fulfill this request before v1.28.0 got released.

[sohankunkerkar]

related to #7079