Add support for UniSpeech and UniSpeechSat models

[xenova]

Follow-up to #611

Example usage:

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

// Create an Automatic Speech Recognition pipeline
const transcriber = await pipeline('automatic-speech-recognition', 'Xenova/unispeech-sat-base-100h-libri-ft');

// Transcribe audio
const url = 'https://huggingface.co/datasets/Xenova/transformers.js-docs/resolve/main/jfk.wav';
const output = await transcriber(url);
// { text: 'AND SO MY FELLO AMERICAN ASK NOT WHAT YOUR COUNTRY CAN DO FOR YOU ASK WHAT YOU CAN DO FOR YOUR COUNTRY' }

[HuggingFaceDocBuilderDev]

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