Add support for using WireAPI:Responses with Ollama

[scaryrawr]

What feature would you like to see?

There's a warning when using Ollama about moving to the responses API. for Ollama it's hard coded to use Chat. Since not everyone may have their Ollama up-to-date it would be nice to have an experimental flag to enable responses.

Additional information

Ollama recently added responses support https://docs.ollama.com/api/openai-compatibility#%2Fv1%2Fresponses

[etraut-openai]

We're working with one of the ollama maintainers on a fix for this.