Add scanner support to POS UI Extensions

As of May 15, camera and hardware scanning is supported for POS UI Extensions. Available for POS UI Extensions version 1.1.2 and POS app version 8.9.0.

CameraScanner This new component utilizes the device's camera for scanning. The CameraScanner provides a live feed with guidance markers to help users align the camera with barcodes.

Scanner API This new API allows UI extensions to access scanner data and available scanning sources. The API also introduces support for hardware scanners that have external or embeddeed scanning capabilities.