Streaming with Mistral AI reasoning models

[pietervs-prive]

Hi

A while ago you added support for Mistral AI's reasoning models such as 'magistral-small-latest' in the Text handler by introducing an appropriate trait to correctly handle the text and thinking parts of the response.

When I tried to implement the Stream handler I noticed this doesn't have this implemented yet. So when a thinking or text event type is streamed, the Stream handler stops with an array to string conversion error at vendor/prism-php/prism/src/Providers/Mistral/Handlers/Stream.php:144

It would be great if you could fix this similar to the Text handler.

Thanks!