Flip image horizontally and vertically

[lars-reimann]

Is your feature request related to a problem?

A common transformation on images is to flip them either horizontally or vertically.

Desired solution

Add two methods to Image:

• flip_horizontally to flip the image horizontally
• flip_vertically to flip the image vertically

Both should return a new image and leave the original unchanged.

Possible alternatives (optional)

No response

Screenshots (optional)

Additional Context (optional)

No response