ROM::Commands::Graph#call

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Calls root and all nodes with the result from root

Graph results are mappable through `combine` operation in mapper DSL

@example
  create_user = rom.commands[:users].create
  create_task = rom.commands[:tasks].create

  command = create_user
    .curry(name: 'Jane')
    .combine(create_task.curry(title: 'Task'))

  command.call

@return [Array] nested array with command results

@api public
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