Workers AI LLM/Chat calls via binding

[demosjarco]

Checked

• I searched existing ideas and did not find a similar one
• I added a very descriptive title
• I've clearly described the feature request and motivation for it

Feature request

In the constructor options for CloudflareWorkersAI and ChatCloudflareWorkersAI, to allow passing in worker binding instead of using REST api

Motivation

Bindings provide latency and TTFT, and are not beholden to cf global api rate limits. Also it has already been done with CloudflareWorkersAIEmbeddings.

Proposal (If applicable)

Provide a binding option like CloudflareWorkersAIEmbeddings. Also support passing in gateway options for the new native gateway bindings