Cannot pass custom parameters to the provider

[snowyu]

I've added some new options to the llama.cpp, but can not pass to the provider, The all providers can not pass custom parameters too.

import { llamacpp, generateText } from "modelfusion";

const text = await generateText({
  model: llamacpp
    .CompletionTextGenerator({
      maxGenerationTokens: 2048,
      my_custom_param: 'can not pass',
      model: 'mistral-7b-openorca.Q8_0.gguf',
    })
    .withTextPrompt(), // use simple text prompt style

  prompt: "Write a short story about a robot learning to love.",
});