Add new Gemini Model

[godshades]

Hi, gemini have 2 new models (gemini-flash-latest & gemini-flash-lite-latest), can you add this (both api and cli)
https://developers.googleblog.com/en/continuing-to-bring-you-our-latest-models-with-an-improved-gemini-2-5-flash-and-flash-lite-release/