feat: cli: allow editing template metadata (#2159)

This PR adds a CLI command template edit which allows updating the following metadata fields of a template:
- Description
- Max TTL
- Min Autostart Interval

cli/templates.go

@@ -26,6 +26,7 @@ func templates() *cobra.Command {
 	}
 	cmd.AddCommand(
 		templateCreate(),
+		templateEdit(),
 		templateInit(),
 		templateList(),
 		templatePlan(),