Support Google Grounding for Search and Maps

[fatherOfLegends]

Google has special tools for Grounding via search or maps. It would be nice to have these tools included in the package so we can just pass them in the tools call.

https://ai.google.dev/gemini-api/docs/google-search
https://ai.google.dev/gemini-api/docs/maps-grounding

[csells]

agreed! I'm working on v2 or I'd request a PR, but it's best to wait for my v2 to land and then we can address these.