Add support for DINOv2 models

[xenova]

Example usage:

import { pipeline} from '@xenova/transformers';

// Create image classification pipeline
const classifier = await pipeline('image-classification', 'Xenova/dinov2-small-imagenet1k-1-layer');

// Classify an image
const url = 'http://images.cocodataset.org/val2017/000000039769.jpg';
const output = await classifier(url);
console.log(output)
// [{ label: 'tabby, tabby cat', score: 0.8088238835334778 }]

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PR in optimum to add onnx export support: huggingface/optimum#1580

[HuggingFaceDocBuilderDev]

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