Add search by QR code option to register search field

[pld]

Describe the feature request.

1. Add a binary option for search-by-barcode to the register config
   1. it is not required, and default is False
2. When search-by-barcode is True
   1. Must also specify
      1. ~barcode-search-path to define how the data read from QR is converted into a search query [TBD details of this, follow same approach as search field]~
      2. [optional] profile-launch to define the profile to open if a single result is returned
   2. Show a QR code icon on the right side of the search field in the register
   3. On-click launch the QR code reader
      1. Execute the same code as was used for the barcode reader widget
   4. After reading a QR code
      1. Follow the code-path as if the string read from the QR code had been entered in the search field
      2. If profile-launch is defined and there is 1 result, open the result using the profile defined in profile-launch
      3. If there are 0 or >=2 results
         1. show the results in the register
         2. place the value read from the QR code as the text in the search query field
3. Update register docs to add a description of this option

Additional context

• Figma designs and discussion

Acceptance criteria

• [ ] When search-by-qr-code is not set, the QR code icon does not show
• [ ] When search-by-qr-code is False, the QR code icon does not show
• [ ] When search-by-qr-code is True
  • [ ] The QR code icon does show
• [ ] When clicking the QR code icon the QR code reader loads
• [ ] After reading a QR code it
  • [ ] Goes to the profile of the Patient with that QR code if there is one result
  • [ ] Goes to the register and shows the QR code in the search field and no results if there are no results
  • [ ] Goes to the register and shows the QR code in the search field and multiple results if there are >1 results

Area path

1. Modify the register config to enable the QR code reader
2. Open the register
3. Read QR codes using the button in the register search bar

Implementation plan (For Engineers)

• [ ] Use the ML Kit barcode reader to read QR codes
  • [ ] Isolate the QR code loading into its own module so in the feature we can launch the QR code from places other than the search bar
• [ ] Figure out how to encode the search query to use based on the result returned from reading a QR code
• [ ] Figure out how to define the profile to load when the search returns a single result

[pld]

nb: this is not blocked by https://github.com/opensrp/fhircore/issues/3350, but it makes sense to do that first so we have experience integrating QR codes