Add Go implementation of the TTS generation callback (#2213)

go-api-examples/offline-tts-play/run-kokoro-en.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+set -ex
+
+if [ ! -f ./kokoro-en-v0_19/model.onnx ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/kokoro-en-v0_19.tar.bz2
+  tar xf kokoro-en-v0_19.tar.bz2
+  rm kokoro-en-v0_19.tar.bz2
+fi
+
+go mod tidy
+go build
+
+./offline-tts-play \
+  --kokoro-model=./kokoro-en-v0_19/model.onnx \
+  --kokoro-voices=./kokoro-en-v0_19/voices.bin \
+  --kokoro-tokens=./kokoro-en-v0_19/tokens.txt \
+  --kokoro-data-dir=./kokoro-en-v0_19/espeak-ng-data \
+  --debug=1 \
+  "Friends fell out often because life was changing so fast. The easiest thing in the world was to lose touch with someone."