finetunes.public.list endpoint support in the Workers AI binding

[mattzcarey]

Describe the solution

It would be really great to get this endpoint supported natively by the binding: https://api.cloudflare.com/client/v4/accounts/${process.env.CLOUDFLARE_ACCOUNT_ID}/ai/finetunes/public

Allow for dynamic fetching of public LORAs in https://playground.ai.cloudflare.com