Add sutil CLI in cmd/sutil with internal/cli command tree

internal/cli/version.go

@@ -0,0 +1,22 @@
+package cli
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+// newVersionCommand returns `sutil version`, which prints the build
+// version on its own line.
+func newVersionCommand(p Params) *cobra.Command {
+	return &cobra.Command{
+		Use:   "version",
+		Short: "Print the sutil version",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			_, err := fmt.Fprintln(cmd.OutOrStdout(), p.Version)
+
+			return err
+		},
+	}
+}