Add Anthropic models

[alexanderatallah]

This PR:

• Adds Anthropic models, including 100k
• move ModelID to window.ai lib, so that projects like OpenRouter can import it
• changes the format of model strings, but adds backwards compat

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Name	Status	Preview	Comments	Updated (UTC)
window-ai	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 23, 2023 9:56pm