bug: creating LiteLLM with router using from_config doesn't work

[micpst]

What happened?

Initializing router for LiteLLM using from config yields incorrect object, instead of getting initialized litellm.Router current implementation seems to override it completely with arbitrary object provided for the router key.

How can we reproduce it?

Here's the code snippet:

from ragbits.core.llms.base import LLM

llm = LLM.subclass_from_config(
    ObjectContructionConfig(
        type="ragbits.core.llms.litellm:LiteLLM",
        config={
            "model_name": "gpt-4-turbo",
            "router": [
                {
                    "model_name": "gpt-4o",
                    "litellm_params": {
                        "model": "azure/gpt-4o-eval-1",
                },
                {
                    "model_name": "gpt-4o",
                    "litellm_params": {
                        "model": "azure/gpt-4o-eval-2",
                    },
                },
           ],
        },
    )
)
print(llm.router)

It prints [{'model_name': 'gpt-4o', 'litellm_params': {'model': 'azure/gpt-4o-eval-1'}}, {'model_name': 'gpt-4o', 'litellm_params': {'model': 'azure/gpt-4o-eval-2'}}], but I'd expect to get an initialized litellm.Router here instead.