def initialize(status, out, err)
      super(status)
      @out = out
      @err = err
    end
Create a new CommandResult
@example
status = ProcessExecuter.spawn(*command, timeout:, out:, err:)
CommandResult.new(status, out_buffer.string, err_buffer.string)
@param status [ProcessExecuter::Status] The status of the process
@param out [String] The standard output of the process
@param err [String] The standard error of the process