add open-source provider AI/ML API

[OctavianTheI]

Is your feature request related to a problem? Please describe.
Our users sent requests to integrate AI/ML API with your product, we'd like to deliver.
If you can give us a green light - we'd be happy to investigate the current compatibility, write any code and docs neccessary, and send it to you for approval :)

Describe the solution you'd like
Need a green light to start the integration (not to waste dev resources)

Describe alternatives you've considered
If we are compatible - we will provide a code snippet for the docs, and leave a link to your docs in our documentation too

Additional context
Our website

[danieldekay]

it will be easiest if you add support for your endpoints directly into the upstream library langchain.

[ElishaKay]

Welcome @OctavianTheI

You have the green light

@danieldekay is raising a good point as well regarding the implementation

The LLM's supported by GPTR are leveraging the Langchain LLM integrations under the hood

This gives users the added advantage of Langsmith logging (including logs of errors and cost per LLM call)