Enable ui.image to accept Pillow Image object

[nghia-vo]

I would like to add more features to a client app (broh5) where it needs to display an image (using ui.image) and a plot of histogram or line profile (using ui.pyplot) side by side. Currently ui.image does not accept a numpy array or image object but a string. Could we make ui.image accept Pillow image object too? Some thing like this:

import numpy as np
from PIL import Image
from nicegui import ui

array = np.random.randint(0, 256, (100, 100), dtype=np.uint8)
image = Image.fromarray(array)
ui.image(image)

ui.run()

and an option figsize=(4,5) to adjust the figure size.

[falkoschindler]

Thanks for the idea, @nghia-vo!
I quickly created PR #2069. What do you think?

[nghia-vo]

Looking great! Please merge it. I keen to try :)