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Add support for new google-genai SDK in Google LLM integration

Add support for new google-genai SDK in Google LLM integration: a task in LegoFlow-SWE (Harbor dataset). The Ragas Google LLM integration currently only supports the deprecated google-generativeai library, which is scheduled to lose support. Users need to be able to use the new official…

The task

The Ragas Google LLM integration currently only supports the deprecated `google-generativeai` library, which is scheduled to lose support. Users need to be able to use the new official `google-genai` SDK, but the integration does not recognize the new client objects or route them correctly.

Part of Lego-X/LegoFlow-SWE.