statelint doesn't support all Map options

[xentek]

For given input:

{
  "peas": ["a", "b", "c"],
  "queue": "example"
}

This state machine should be valid:

{
  "StartAt": "PeasAndQueues",
  "States": {
    "PeasAndQueues": {
      "Type": "Map",
      "End": true,
      "ItemsPath": "$.peas",
      "MaxConcurrency": 0,
      "Parameters": {
        "p.$": "$$.Map.Item.Value",
        "q.$": "$.queue"
      },
      "Iterator": {
        "StartAt": "DoWork",
        "States": {
          "DoWork": {
            "Type": "Task",
            "End": true,
            "Resource": "arn:aws:lambda:us-east-1:000000:function:do-work"
          }
        }
      }
    }
  }
}

Yet I get:

2 errors:
 Field "ItemsPath" not allowed in State Machine
 Field "MaxConcurrency" not allowed in State Machine

(error output shortened for clarity)

Happy to submit a patch, but wasn't sure if data/StateMachine.j2119 was generated or maintained by hand -- a cursory glance at the code seems to suggest this file is what needs to be changed to support ItemsPath and MaxConcurrency.

[zbintliff]

@melalawi can this be released please?