fix hidden flag property (#893)

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## What was changed
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Support `hidden: true` flag. It has no effect right now.

## Why?
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While there isn't a use case anymore in the CLI, I was told for the
Cloud CLI we want to add Temporal-specific flags for test environments
that we don't want to expose to the end user in help texts.

## Checklist
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1. Closes <!-- add issue number here -->

2. How was this tested:
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3. Any docs updates needed?
<!--- update README if applicable
      or point out where to update docs.temporal.io -->

Author: stephanos

internal/commandsgen/code.go

@@ -458,5 +458,8 @@ func (o *Option) writeFlagBuilding(selfVar, flagVar string, w *codeWriter) error
 	if o.Deprecated != "" {
 		w.writeLinef("_ = %v.MarkDeprecated(%q, %q)", flagVar, o.Name, o.Deprecated)
 	}
+	if o.Hidden {
+		w.writeLinef("_ = %v.MarkHidden(%q)", flagVar, o.Name)
+	}
 	return nil
 }

internal/commandsgen/parse.go

@@ -27,6 +27,7 @@ type (
 		Aliases            []string `yaml:"aliases,omitempty"`
 		EnumValues         []string `yaml:"enum-values,omitempty"`
 		Experimental       bool     `yaml:"experimental,omitempty"`
+		Hidden             bool     `yaml:"hidden,omitempty"`
 		HiddenLegacyValues []string `yaml:"hidden-legacy-values,omitempty"`
 	}
 

internal/temporalcli/commands.yaml

@@ -108,6 +108,7 @@
 #       default: The default value. No default means zero value of the type. (string)
 #       enum-values: A list of possible values for the string-enum type. (string[])
 #       aliases: A list of aliases for the option. (string[])
+#       hidden: Hides the option from help output. (bool)
 #   option-sets: A list of option sets. (string[])
 
 # * name, summary, and descrption are required fields. All other fields are optional.
@@ -3374,7 +3375,6 @@ commands:
       - name: queue-rps-limit-reason
         type: string
         description: Reason for queue rate limit update.
-        hidden: true
       - name: fairness-key-rps-limit-default
         type: string
         display-type: float|default
@@ -3384,7 +3384,6 @@ commands:
       - name: fairness-key-rps-limit-reason
         type: string
         description: Reason for fairness key rate limit update.
-        hidden: true
 
   - name: temporal workflow
     summary: Start, list, and operate on Workflows