Ability to override voice independent from language settings or make use of the SecondaryLocaleList

[bbence84]

I really like this addon, and I could setup a very nice LLM based voice assistant, it works very well with a Wyoming Satellite, etc.
I would like to use the new OpenAI based voices on Azure, that are multilangual and can speak other languages very well, even if you don't specify the language. These multilangual voices currently appear only under the American English language, and so cannot be used if the assistant is set to use Hungarian (i.e. speech to text does not work, etc.)
Would it be possible to have a configuration that could explictly set the voice name? Alternatively, I also see the Azure voice list API provices a SecondaryLocaleList array, which could also be used to populate the voice list of other languages that the multilanguage voice supports.
I would gladly contribute with a PR, but I am just starting to learn Homeassistant and don't know how easy it is to fork an add-on and test the forked add-on in my Homeassistant. :)
Thanks!