BE: Possible bug: numberOfPieces field defined as string type

Overview: In items, the JSON field numberOfPieces is defined as a string type although the data appear to be numbers. For reporting, this requires casting to an integer type and potentially other difficulties. (We have seen Unicode characters such as "２" within this field in deployed FOLIO instances; though I do not know if the data were imported via the proper APIs.) If possible, please consider whether an integer type might be more suitable for this field.

In the item record (https://github.com/folio-org/mod-inventory-storage/blob/master/ramls/item.json)

• The data property numberOfPieces is to be changed from being defined as type string to be type integer
• The description of the data property is changed as well and should be: "Number of pieces"

},
    "numberOfPieces": {
      "type": "integer",
      "description": "Number of pieces"