Text to Speech - add new languages support

[IgorSwat]

Problem Description

As it stands for now, the RNE implementation of the Kokoro model supports 2 languages: 🇺🇸 American English and 🇬🇧 British English. Hovewer, the Kokoro model itself provides a support for many other languages, such as:

• 🇪🇸 Spanish
• 🇫🇷 French
• 🇮🇹 Italian
• 🇧🇷 Brazilian Portuguese
• 🇨🇳 Mandarin Chinese
  The only significant requirement to support those languages is to provide an appropriate phonemization, similar to the one for English.

There is also a possibility of adding an external language, not supported by Kokoro originally, by finetuning the model and training a new voice.

What should be done

In case of a language already supported by Kokoro:

1. Implement phonemization for given language in the phonemization package

In case of an external language:

1. Implement phonemization for given language in the phonemization package
2. Select an appropriate dataset containing speech samples for given language
3. Finetune the model to produce a new voice for given language

Benefits to React Native ExecuTorch

Expands the Text to Speech function accessability for non-english users.