Add model info JSON files for 2.7k models

[viswavi]

Description

Add model info (description, # of downloads, model size in bytes), extracted using @zhaochenyang20's script (which will be added in a subsequent PR).

We fetch all text generation and text2text generation models from HuggingFace. For all PyTorch-based models with a nonempty README.md file and a nonempty pytorch_model.bin file (or similar file), we store the following pieces of information in a json file:

1. HuggingFace model name
2. model description
3. # of downloads
4. model size (in bytes)

References

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Blocked by

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[zhaochenyang20]

Thanks a lot!