azure: stop specifying english for multilingual (vocodedev#302)

* azure: stop specifying english for multilingual

* - adds language code parameter to synthesizer_config
- splits on the voice_name to figure out the top level lang, then uses the language_code to house the message

* move reading data into ephemeral thread

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Co-authored-by: Ajay Raj <[email protected]>

test prerelease for gh action

update for 0.1.110 (vocodedev#168)