Gemini 2.0 support

[XInTheDark]

https://developers.googleblog.com/en/the-next-chapter-of-the-gemini-era-for-developers/

Hey! Hope you're doing well. Gemini 2.0 flash just released, and with it, a new SDK and some new capabilities (e.g. Google Search). Perhaps the package can also be updated accordingly - function calling is a very nice feature to have IMO :)

[censujiang]

I have same request