bridge/debug: refactor

Move the debug command out of vaa.go in preparation for adding
additional comments.
Change-Id: Id387eace5d488952331f5d7f16c43b235676df24

bridge/cmd/debug/debug.go

@@ -0,0 +1,12 @@
+package debug
+
+import "github.com/spf13/cobra"
+
+var DebugCmd = &cobra.Command{
+	Use:   "debug",
+	Short: "Debugging utilities",
+}
+
+func init() {
+	DebugCmd.AddCommand(decodeVaaCmd)
+}

bridge/cmd/debug/vaa.go

@@ -9,11 +9,6 @@ import (
 	"strings"
 )
 
-var DebugCmd = &cobra.Command{
-	Use:   "debug",
-	Short: "Debugging utilities",
-}
-
 var decodeVaaCmd = &cobra.Command{
 	Use:   "decode-vaa [DATA]",
 	Short: "Decode a hex-encoded VAA",
@@ -34,7 +29,3 @@ var decodeVaaCmd = &cobra.Command{
 		}
 	},
 }
-
-func init() {
-	DebugCmd.AddCommand(decodeVaaCmd)
-}