Support for "any" embedding/chat model

[FrancescoCaracciolo]

Hello, I would like to propose a way of supporting every embedding or chat model instead of limiting to OpenAI and Ollama.

classDiagram
    EmbeddingModel <|-- OpenAIEmbeddingModel
    EmbeddingModel<|-- OllamaEmbeddingModel
    ChatModel <|-- OpenAIChatModel
    ChatModel <|-- OllamaChatModel 

    class EmbeddingModel {
        + dimension
        + embed(str text) np.array
    }

    class ChatModel {
        + extract_concepts(text) list
        + generate_text(history) str
    }

    class OpenAIChatModel {

    }

    class OllamaChatModel {

    }

    class OpenAIEmbeddingModel {

    }

    class OllamaEmbeddingModel {

    }

Obviously, additional/different methods might be specified. Advantages of this structure:

• Ability for the user to create subclasses of EmbeddingModel and ChatModel
• More modular, easier to extend, update and read

[caspianmoon]

Thanks! I have already started working on a method to implement support for other embedding and chat models.