[JS] Support seed for Ollama generation

[zbarbuto]

It can be useful to provide a seed value for reproducible outputs when tweaking prompts and other parameters. The Ollama API supports this via a seed option along with the normal options such as temperature and top_k:

curl http://localhost:11434/api/generate -d '{
  "model": "llama3.2:latest",
  "prompt": "Give me the name of a random fruit?",
  "stream": false,
  "options": {
    "seed": 123
  }
}' | jq '.response'

# Output is the same for every call
"The random fruit I've chosen is... Guanabana (also known as Soursop)!"

seed is currently not supported in config:

and even when typecast to any is ignored in the request as the result given from the model is different

  const llmResponse = await generate({
    model: 'ollama/llama3.2:latest',
    prompt: 'Give me the name of a random fruit?',
    config: <any>{
      seed: 123,
    },
  });

 console.log(await llmResponse.text());

// The fruit is: Papaya
// (different with every call)

It would be good to support seed in the config parameter when calling generate() for Ollama along with any other plugins that would support it.