Adding ctr memory and cpu flags

Adds ctr run --memory-limit for all platforms.
Adds ctr run --cpu-count for Windows platforms.

Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>

cmd/ctr/commands/run/run_unix.go

@@ -139,6 +139,10 @@ func NewContainer(ctx gocontext.Context, client *containerd.Client, context *cli
 			// NOTE: can be set to "" explicitly for disabling cgroup.
 			opts = append(opts, oci.WithCgroup(context.String("cgroup")))
 		}
+		limit := context.Uint64("memory-limit")
+		if limit != 0 {
+			opts = append(opts, oci.WithMemoryLimit(limit))
+		}
 	}
 
 	cOpts = append(cOpts, containerd.WithRuntime(context.String("runtime"), nil))