add AI/ML API as adapter (analogous to OpenRouter)

[OctavianTheI]

Hi!

I'm Sergey from the Integrations team over at AI/ML API, a startup with 150K+ users, providing over 300 AI models in one place

I though it would be dope to collab with you guys. We already got integrations with Langflow, Agno, and AutoGPT - so our integrations team is pretty seasoned, although Lua would be a new challenge :)

Say you're interested, and we'll test the compatibility, update the code/docs to include us, create a PR and add a tutorial on using Kong with AI/ML API to our docs