Add ViTamin models

[Beckschen]

Add the ViTamin model, which is trained on public DataComp-1B using OpenCLIP framework and obtains 82.9% zero-shot ImageNet-1K accuracy with 436M parameters. It achieves the state-of-the-art performance on zero-shot image classification, multi-modal retrieval, open-vocabulary detection and segmentation, and large multi-model models.

The code of ViTamin models are modified from vision_transformer_hybrid.py in the timm codebase.

This ViTamin work has been accepted to CVPR 2024 (https://arxiv.org/pdf/2404.02132).

[HuggingFaceDocBuilderDev]

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[rwightman]

@Beckschen thanks, probably a few more changes before the tests pass, if you get stuck I can help in a few days, for starter current failure, the dataclass init needs to use the default factory pattern as here: https://github.com/huggingface/pytorch-image-models/blob/main/timm/models/maxxvit.py#L137`

[Beckschen]

Thanks very much, Ross @rwightman ! I've fixed the issue with the dataclass initialization. Could you please review it before proceeding with the merge? Thanks again!