Add Coqui SpeedySpeech LJSpeech F32 GGUF

#8

Converted from Coqui tts_models/en/ljspeech/speedy-speech and vocoder_models/en/ljspeech/hifigan_v2 for the native audio.cpp community model implementation.

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This branch has merge conflicts in the following files:
  • .gitattributes

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