Add export tasks

[xianbaoqian]

Context: https://huggingface.slack.com/archives/C02ERUY9TKK/p1669743642830359

[xianbaoqian]

[xianbaoqian]

{
    "adapter_transformers": [
        "question-answering",
        "text-classification",
        "token-classification"
    ],
    "allennlp": [
        "question-answering"
    ],
    "asteroid": [
        "audio-source-separation",
        "audio-to-audio"
    ],
    "diffusers": [
        "text-to-image"
    ],
    "doctr": [
        "object-detection"
    ],
    "espnet": [
        "text-to-speech",
        "automatic-speech-recognition"
    ],
    "fairseq": [
        "text-to-speech",
        "audio-to-audio"
    ],
    "fastai": [
        "image-classification"
    ],
    "fasttext": [
        "feature-extraction",
        "text-classification"
    ],
    "flair": [
        "token-classification"
    ],
    "k2_sherpa": [
        "automatic-speech-recognition"
    ],
    "keras": [
        "image-classification"
    ],
    "nemo": [
        "automatic-speech-recognition"
    ],
    "paddlenlp": [
        "conversational",
        "fill-mask"
    ],
    "pyannote_audio": [
        "automatic-speech-recognition"
    ],
    "sentence_transformers": [
        "feature-extraction",
        "sentence-similarity"
    ],
    "sklearn": [
        "tabular-classification",
        "tabular-regression",
        "text-classification"
    ],
    "spacy": [
        "token-classification",
        "text-classification",
        "sentence-similarity"
    ],
    "speechbrain": [
        "audio-classification",
        "audio-to-audio",
        "automatic-speech-recognition",
        "text-to-speech",
        "text2text-generation"
    ],
    "stanza": [
        "token-classification"
    ],
    "superb": [
        "automatic-speech-recognition",
        "speech-segmentation"
    ],
    "timm": [
        "image-classification"
    ]
}

[osanseviero]

Very nice! The solution seems fine to me. I left some suggestions to make this easier to maintain and understand, but overall LG

[Narsil]

Agree with @osanseviero on pretty much all comments.

[osanseviero]

LGTM!