started animation of spherical

[shimwell]

This PR adds an animation to the example scripts

Todo

• add pf magnets
• add tf magnets
• add divertor

[shimwell]

def combine_png_files(frames, stem1, stem2, combined_stem):
    for frame in range(frame_count):
        filename1 = f"{stem1}{frame:03d}.png"
        filename2 = f"{stem2}{frame:03d}.png"
        image1 = Image.open(filename1)
        image2 = Image.open(filename2)

        # Assuming both images have the same size
        combined_image = Image.new('RGB', (image1.width + image2.width, image1.height))
        combined_image.paste(image1, (0, 0))
        combined_image.paste(image2, (image1.width, 0))

        combined_image.save(f"{combined_stem}{frame:03d}.png")
        print(f"Combined image saved as {combined_stem}{frame:03d}.png")