[draft]Add onnx export script

[RRoundTable]

Objective

Export dinov2 to onnx for serving.

Changed

• Fix hubconf to get Attention to export onnx
• Fix minor part in model
• Add onnx export script

Run

pip install -r requirements.txt

python script/convert-to-onnx.py

Huggingface

Check huggingface model

Related Issue

https://github.com/facebookresearch/dinov2/issues/19