New feature: Add support for Azure TTS

[lorrylockie]

For the following reasons:

1、New capabilities support, users could choose freely 2、The price of Azure TTS Service is cheaper than Play.ht

The code has been tested both locally and Railway platform.

[DavidZhiXing]

how do you configure which tts to use?

[lorrylockie]

Not a configuration-based approach,just modifying the source code. file: src/index.ts

// import { textToSpeech } from "./lib/htApi";
import { textToSpeech } from "./lib/azureTTS";