LearnLM - for teaching and learning

learnlm-1.5-pro-experimental model is supported!

Ref:

• https://ai.google.dev/gemini-api/docs/learnlm
• https://blog.google/outreach-initiatives/education/google-learnlm-gemini-generative-ai/

Other improvements:

• Support embeddings and models API endpoints.
• Serve locally with Node, Deno, Bun.
• Deploy to Deno instruction.
• Support audio input.