Adds support for Windows ArgsEscaped images

Adds support for Windows container images built by Docker
that contain the ArgsEscaped boolean in the ImageConfig. This
is a non-OCI entry that tells the runtime that the Entrypoint
and/or Cmd are a single element array with the args pre-escaped
into a single CommandLine that should be passed directly to
Windows rather than passed as an args array which will be
additionally escaped.

Signed-off-by: Justin Terry <jlterry@amazon.com>

oci/spec_opts_unix.go

@@ -57,3 +57,7 @@ func WithCPUCFS(quota int64, period uint64) SpecOpts {
 		return nil
 	}
 }
+
+func escapeAndCombineArgs(args []string) string {
+	panic("not supported")
+}