Gemini 2.0 Flash generally available; Gemini 2.0 Pro and Flash-Lite in preview

Model updates:

• Released gemini-2.0-flash-001, a generally available (GA) version of Gemini 2.0 Flash that supports text-only output.
• Released gemini-2.0-pro-exp-02-05, an experimental public preview version of Gemini 2.0 Pro.
• Released gemini-2.0-flash-lite-preview-02-05, an experimental public preview model optimized for cost efficiency.

API updates:

• Added file input and graph output support to code execution.

SDK updates:

• Released the Google Gen AI SDK for Python to general availability (GA).