Better DSPy Integration with HuggingfacePipeline models

[BlueKiji77]

Checked

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Feature request

A more thorough integration with DSPy allowing the use of Langchain capabilities with DSPy.
The integration would work is the model is accessed through an a client or locally (Huggingface model, Ollama ...)

Motivation

The current integration with Langchain is rather limited and hardcodes GPT4 in _build_signature function from LangchainPredict

Replacing GPT4 with a HuggingfacePipeline does not work either as dspy.Predict does not mesh well with HuggingfacePipeline

Proposal (If applicable)

No response