module request: localai

speechd is a 'common high-level interface to speech synthesis', providing a bridge between TTS engines and applications consuming TTS functionality (such as screen reader software). arguably tho, it could benefit from more natural-sounding TTS engines.

[LocalAI](https://github.com/mudler/LocalAI) is a common interface over various machine learning models, for tasks [including](https://localai.io/features/text-to-audio/) TTS. it also helps install these models.
it would seem nice if speechd offered a module for LocalAI, so as to offer more natural-sounding voices, while speechd wouldn't need to worry about individual ML models, whereas LocalAI would not need to worry about individual screen reader applications.

/cc @mudler