Feature: QR scan-able text input field

[pphetra]

Enable text input field to support QR code scan.

Json definition should be something like this.

{
    "id": "bag_id",
    "label": "QR ถุง",
    "name": "bag_id",
    "type": "text",
    "scan": true,
    "required": true,
    "minLength": 4,
    "maxLength": 4
  }