OpenAI: Add keys

[AkhileshNegi]

We need to create an endpoint where users or organizations can provide their OpenAI API keys. This API key will then be securely stored and used to access OpenAI services. The goal is to enable clients to interact with the OpenAI via their own API keys, ensuring that the service is tailored to their specific OpenAI usage and billing.

[dlobo]

This is lower priority right?