camerax拍照函数
https://developer.android.google.cn/reference/androidx/camera/core/ImageCapture#takePicture(androidx.camera.core.ImageCapture.OutputFileOptions,%20java.util.concurrent.Executor,%20androidx.camera.core.ImageCapture.OnImageSavedCallback)
https://developer.android.google.cn/reference/androidx/camera/core/ImageCapture#takePicture(androidx.camera.core.ImageCapture.OutputFileOptions,%20java.util.concurrent.Executor,%20androidx.camera.core.ImageCapture.OnImageSavedCallback)