Add array support to v2 attachment field types

[doneill]

Add support for attachment field as an array of objects

{
  "field_name": {
    "type": "array",
    "title": "Attachment Field",
    "description": "Upload files",
    "deprecated": false,
    "items": {
      "properties": {
        "uploadId": {
          "format": "uuid",
          "type": "string"
        }
      },
      "required": ["uploadId"],
      "type": "object",
      "unevaluatedProperties": false
    },
    "uniqueItems": true,
    "minItems": 0,
    "maxItems": 5
  }
}

Action:

• Add support for arrays in ATTACHMENT case
• Tighten attachment property type
• Add validation guard mirroring CHOICE_LIST
• Update tests

Expectation:

• validateV2Schema accepts and handles arrays in attachment fields in React Native app implementation