feat(config): add base_url for open_ai in config

[S1M0N38]

The ability to set a base_url facilitates the use of this plugin with any OpenAI-like API.

For instance, if we set base_url to the address of LiteLLM proxy, it would become possible to use this plugin with a multitude of different LLMs (including open-source local models with Ollama).

Naturally, to prevent breaking changes, the default value for such a setting should be "https://api.openai.com/v1".

In my opinion, this setting should be incorporated in the open_ai settings. This is because, similar to api_key, it's a parameter found in OpenAI’s official Python API:

• Default for SyncAPIClient
• Default for AsyncAPIClient

[S1M0N38]

Here is the PR: #59

[ishaan-jaff]

Hi @S1M0N38 do you use LiteLLM Proxy ? Can we hop on a call to learn how we can make litellm better for you?

Link to my cal for your convenience: https://calendly.com/d/4mp-gd3-k5k/litellm-1-1-onboarding-chat?month=2024-02

[christianjuth]

@S1M0N38 do you think a change like this would allow integration with something that runs locally like LM Studio? That application allows you to interact with the model via a port on localhost. Would love to try a totally offline and free AI coding experience.
https://lmstudio.ai/