feat: add eleven labs tts support

[rzc331]

I created a side feature that supports eleven labs text to speech, for those who are not very satisfied with unnatural system built-in synthetic voice.

The feature was hastily written (mostly by ChatGPT), it works but it replaces the built-in synthetic voice option. Maybe a better implementation is needed to add eleven labs into the voice list.

All you need to do is to fill in your ELEVEN_LABS_API_KEY in eleven_labs.ts under ./src/lib

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[rzc331]

two params (stability, similarity_boost) can be adjusted for the target voiceId in eleven_labs.ts

const data = {
        text: text,
        voice_settings: { stability: 0, similarity_boost: 0 }
    };

[rzc331]

Also included support for returning lines (\n) in text messages. Lots of replies from ChatGPT have paragraphs

[rzc331]

Added support to print response word by word in a fixed interval. Again, code mostly written by ChatGPT so it's not that perfect