[feat] support for local/hybrid firebase models

[csells]

Check out these docs: https://firebase.google.com/docs/ai-logic/hybrid-on-device-inference?api=dev

[mit-mit]

tentatively moving to 1.0

[csells]

@mit-mit the local LLM support in firebase_ai is in preview and is only supported on the web -- is this something you want to bake into the stable v1 release of the AI Toolkit?

[mit-mit]

@anderdobo wdyt?