Add usage string when command fails with incorrect arguments (#1276)

## Changes
Add usage string when command fails with incorrect arguments

Fixes #1119

## Tests
Example output

```
> databricks libraries cluster-status 
Error: accepts 1 arg(s), received 0

Usage:
  databricks libraries cluster-status CLUSTER_ID [flags]

Flags:
  -h, --help   help for cluster-status

Global Flags:
      --debug            enable debug logging
  -o, --output type      output type: text or json (default text)
  -p, --profile string   ~/.databrickscfg profile
  -t, --target string    bundle target to use (if applicable)
```

.codegen/service.go.tmpl

@@ -194,7 +194,7 @@ func new{{.PascalName}}() *cobra.Command {
 	cmd.Args = func(cmd *cobra.Command, args []string) error {
 		{{- if $hasDifferentArgsWithJsonFlag }}
 		if cmd.Flags().Changed("json") {
-			err := cobra.ExactArgs({{len .Request.RequiredPathFields}})(cmd, args)
+			err := root.ExactArgs({{len .Request.RequiredPathFields}})(cmd, args)
 			if err != nil {
 			{{- if eq 0 (len .Request.RequiredPathFields) }}
 				return fmt.Errorf("when --json flag is specified, no positional arguments are required. Provide{{- range $index, $field := .Request.RequiredFields}}{{if $index}},{{end}} '{{$field.Name}}'{{end}} in your JSON input")
@@ -206,7 +206,7 @@ func new{{.PascalName}}() *cobra.Command {
 		}
 		{{- end }}
 		{{- if $hasRequiredArgs }}
-		check := cobra.ExactArgs({{len .RequiredPositionalArguments}})
+		check := root.ExactArgs({{len .RequiredPositionalArguments}})
 		return check(cmd, args)
 		{{- else}}
 		return nil