is that possible to change default image from BGR to RGB at 5.0 version?

### Describe the feature and motivation

Users always do the following:

```.py
img_bgr = cv2.imread("PATH") # OpenCV decode the image and swap B and R.
im_rgb = cv2.cvtColor(img_bgr, cv2.COLOR_BGR2RGB) # than swap R and B back.
```

### Additional context

_No response_