Support for LayoutLMv3

[somus]

Model description

I'm trying to setup OCR pipeline with LayoutLMv3. Support for it would be great

Prerequisites

• The model is supported in Transformers (i.e., listed here)
• The model can be exported to ONNX with Optimum (i.e., listed here)

Additional information

No response

Your contribution

Unfortunately, I don't have much experience with this library