Get the default voice for a given language code.
The options for getting the default voice
The language code to match
The default voice for the language, or null if none is available
Get the voices for a given language code.
The options for getting voices
The language code to match
The minimum number of voices to return
The voices for the given language code
Interface for a voice provider that can synthesize speech. A voice provider can be either the browser's built-in speech synthesis or an external service like ElevenLabs.