Add itemLimit parameter to the item limit error

Overview:
UI needs to receive itemLimit as a parameter to be able to translate error message properly. itemLimit parameter object should be added to the parameters array of the error when patron reaches item limit during check-out.

Example:

{
  "message": "Error message",
  "parameters": [
    {
      "key": "itemLimit",
      "value": "5"
    }
  ]
}

Steps to Reproduce:
check UIU-2652

Expected Results:
itemLimit parameter should be present in the API response

Actual Results:
No itemLimit parameter, limit is only mentioned in the error message