Add onConfigureSession (av)

To the IVirtualCameraCallback interface of the VirtualCameraService.

CameraMetadata is passed as VirtualCameraMetadata.

Bug: 371167033
Test: atest virtual_camera_tests
Test: atest VirtualCameraTest
Test: atest VirtualCameraCaptureTest
Flag: android.companion.virtualdevice.flags.virtual_camera_metadata
Change-Id: I56fe4f461185701b06f5add78d8cc5a0aee462fe