Add mobilevitv2

[xenova]

Looks good 👍

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

const url = 'https://huggingface.co/datasets/Xenova/transformers.js-docs/resolve/main/tiger.jpg';
const classifier = await pipeline('image-classification', 'Xenova/mobilevitv2-1.0-imagenet1k-256', {
    quantized: false,
});
const output = await classifier(url);
// [{ label: 'tiger, Panthera tigris', score: 0.6491137742996216 }]

Closes #720

[HuggingFaceDocBuilderDev]

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