[model] support medgemma

[slin000111]

PR type

• Bug Fix
• New Feature
• Document Updates
• More Models or Datasets Support

PR information

Write the detail information belongs to this PR.
support medgemma, #7160

Experiment results

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[gemini-code-assist]

Summary of Changes

Hello @slin000111, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request integrates several MedGemma models into the system, expanding the range of supported models. It includes necessary updates to the model registry, documentation, and adds dedicated test cases to verify the functionality of both text and vision capabilities of these new models.

Highlights

• New Model Support: Added support for several MedGemma models, including medgemma-27b-text-it, medgemma-4b-pt, medgemma-4b-it, and medgemma-27b-it.
• Documentation Updates: The Supported-models-and-datasets.md documentation files (both English and Chinese versions) have been updated to list the newly supported MedGemma models.
• Model Registration: The gemma.py model definition file has been updated to register the new MedGemma models under their respective gemma3_text and gemma3_vision template types.
• New Test Cases: Introduced new test cases (test_medgemma3 and test_medgemma3_vision) to validate the functionality of the text-based and vision-based MedGemma models, ensuring correct integration and response generation.

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[gemini-code-assist]

Code Review

This pull request adds support for medgemma models. The changes include updating the supported model lists in the documentation, registering the new model IDs, and adding corresponding tests. The new tests for both the text and vision models are well-written and follow the existing testing patterns.

I have a minor suggestion for the documentation to improve clarity on the required transformers version for one of the new models. Overall, the changes are good and integrate the new models effectively.

[gemini-code-assist]

For consistency and clarity, it's better to specify the package name for the required version. The value 4.52.0.dev0 is ambiguous.

Suggested change

	|[google/medgemma-27b-text-it](https://modelscope.cn/models/google/medgemma-27b-text-it)|gemma3_text|gemma3_text|4.52.0.dev0|✘|-|[google/medgemma-27b-text-it](https://huggingface.co/google/medgemma-27b-text-it)|
	|[google/medgemma-27b-text-it](https://modelscope.cn/models/google/medgemma-27b-text-it)|gemma3_text|gemma3_text|transformers>=4.52.0.dev0|✘|-|[google/medgemma-27b-text-it](https://huggingface.co/google/medgemma-27b-text-it)|

[gemini-code-assist]

For consistency and clarity, it's better to specify the package name for the required version. The value 4.52.0.dev0 is ambiguous.

Suggested change

	|[google/medgemma-27b-text-it](https://modelscope.cn/models/google/medgemma-27b-text-it)|gemma3_text|gemma3_text|4.52.0.dev0|✘|-|[google/medgemma-27b-text-it](https://huggingface.co/google/medgemma-27b-text-it)|
	|[google/medgemma-27b-text-it](https://modelscope.cn/models/google/medgemma-27b-text-it)|gemma3_text|gemma3_text|transformers>=4.52.0.dev0|✘|-|[google/medgemma-27b-text-it](https://huggingface.co/google/medgemma-27b-text-it)|