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VisionKit enhancement: provide option to set default color mode for VNDocumentCameraViewController

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Suggestion

Description
Please provide convenience initialized (or property on instance) to pre-select color mode for VNDocumentCameraScan instance so that on camera presentation preffered color mode is automatically selected according to use case - e.g. for scanning documents grayscale mode would be preselected and would also save disk space on user device.

Example (as convenience initializer):
VNDocumentCameraViewController  *documentScanController = [[VNDocumentCameraViewController alloc] initWithColorMode:VNDocumentCameraColorModeGrayscale];


Alternative (as instance property):
VNDocumentCameraViewController  *documentScanController = [[VNDocumentCameraViewController alloc] init];
documentScanController.colorMode = VNDocumentCameraColorModeGraycale;