feat(cli): Create new option --dry-run=json
          #1640
        
          
      
                
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When the value
jsonis specified to the parameter--dry-run=, any proposals that would otherwise be printed to the console will be printed in JSON format, for ease of parsing.This feature is required for the HostOS rollout.
Additionally, the parameter
--nodes-in-groupis upgraded to use the clap infrastructure to validate its value, and to only accept positive integers (it made no sense to use negative integers).