Add support for Google's generativeai

[micouy]

Only Google Cloud solution is supported. Please add support for generativeai, the Gemini provider.

https://ai.google.dev/gemini-api/docs/quickstart?lang=python

[XueDx]

need it!

[vargacypher]

I could help working on it.

[vargacypher]

@rohitprasad15 i've start the changes in the GoogleProvider, but seen that we're going to add Function calling to the Provider, i`m already making the changes in code so it can make function call using generativeai, should we add to the current PR #144 ?

Or open another one without the logic of Function Call and after merged, open another ?

[vargacypher]

@micouy what do u think about using the new Google Gen AI SDK https://cloud.google.com/vertex-ai/generative-ai/docs/sdks/overview