image processing for llama3.2 (#6963)

[frances720]

Image processing routines for being able to run llama3.2.

This will need to be refactored at some point to support other multimodal models as well.

EDIT: This now includes all of the code for getting vision support to work, and not just the image processing routines. It's still not 100% though, but good enough to test out and kick the tires.

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