Support for gemma2-2b-it(gemma 2nd version) Model Export in Optimum for OpenVINO

[chakka12345677]

Feature request

please provide Support for gemma2 Model Export in Optimum for OpenVINO
version:optimum(1.21.4)
transformers:4.43.4

Motivation

I encountered an issue while trying to export a gemma2 model using the optimum library for ONNX export. The error message suggests that the gemma2 model is either a custom or unsupported architecture, and I need to provide a custom export configuration.

error:raise ValueError(
ValueError: Trying to export a gemma2 model, that is a custom or unsupported architecture, but no custom export configuration was passed as custom_export_configs. Please refer to https://huggingface.co/docs/optimum/main/en/exporters/onnx/usage_guides/export_a_model#custom-export-of-transformers-models for an example on how to export custom models. Please open an issue at https://github.com/huggingface/optimum-intel/issues if you would like the model type gemma2 to be supported natively in the OpenVINO export

Your contribution

It would be great if support for the gemma2 model could be added natively in the optimum library for OpenVINO export. Alternatively, detailed guidance on how to create a custom export configuration for this model would be appreciated.i

[yonkel]

+1, adding ONNX support for gemma-2 models would be appreciated