[IMP] tools,base: remove image encoding parameter

The image tools were accepting an encoding parameter but it was never used.
Indeed the given images are always encoded in base64.

`image_colorize` was the only method not taking base64 directly, so it has been
modified for consistency. This allows to change the code in partner to not
base64 decode the image in some case just to be base64 encode it again after.

`crop_image` and `limited_image_resize` have been slightly refactored to account
for this change, but in this commit their behavior was kept.

task-1958000
PR: #31811

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