feat(examples): add image classification example using quantized vit …

[shovan777]

What does this PR do?

This adds an image classification example using a quantized ViT model as per #169.

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• [x] Did you run all tests locally and make sure they pass.
• [ ] Did you write any new necessary tests?

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[dacorvo]

The CPU tests are failing because of the release of pytorch 2.4.1 last week (I have a guard preventing to use torch._int_mm for versions up to 2.4.0, but it seems it is still inaccurate in 2.4.1).

[shovan777]

@dacorvo I have made the changes you requested.