Add Koltin and Java API for Kokoro TTS models (#1728)

kotlin-api-examples/test_tts.kt

@@ -3,6 +3,28 @@ package com.k2fsa.sherpa.onnx
 fun main() {
   testVits()
   testMatcha()
+  testKokoro()
+}
+
+fun testKokoro() {
+  // see https://github.com/k2-fsa/sherpa-onnx/releases/tag/tts-models
+  var config = OfflineTtsConfig(
+    model=OfflineTtsModelConfig(
+      kokoro=OfflineTtsKokoroModelConfig(
+        model="./kokoro-en-v0_19/model.onnx",
+        voices="./kokoro-en-v0_19/voices.bin",
+        tokens="./kokoro-en-v0_19/tokens.txt",
+        dataDir="./kokoro-en-v0_19/espeak-ng-data",
+      ),
+      numThreads=2,
+      debug=true,
+    ),
+  )
+  val tts = OfflineTts(config=config)
+  val audio = tts.generateWithCallback(text="How are you doing today?", callback=::callback)
+  audio.save(filename="test-kokoro-en.wav")
+  tts.release()
+  println("Saved to test-kokoro-en.wav")
 }
 
 fun testMatcha() {
@@ -24,9 +46,9 @@ fun testMatcha() {
   )
   val tts = OfflineTts(config=config)
   val audio = tts.generateWithCallback(text="某某银行的副行长和一些行政领导表示，他们去过长江和长白山; 经济不断增长。2024年12月31号，拨打110或者18920240511。123456块钱。", callback=::callback)
-  audio.save(filename="test-zh.wav")
+  audio.save(filename="test-matcha-zh.wav")
   tts.release()
-  println("Saved to test-zh.wav")
+  println("Saved to test-matcha-zh.wav")
 }
 
 fun testVits() {