refactor: extract root command creation to separate file

cmd/motr/main.go

@@ -1,12 +1,7 @@
 package main
 
-import "github.com/spf13/cobra"
-
 func main() {
-	rootCmd := &cobra.Command{
-		Use:   "motr",
-		Short: "Manage a local DWN instance for the Sonr blockchain",
-	}
+	rootCmd := NewRootCmd()
 	rootCmd.AddCommand(NewProxyCmd())
 	if err := rootCmd.Execute(); err != nil {
 		panic(err)

cmd/motr/root.go

@@ -0,0 +1,10 @@
+package main
+
+import "github.com/spf13/cobra"
+
+func NewRootCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "motr",
+		Short: "Manage a local DWN instance for the Sonr blockchain",
+	}
+}