Refactor the JNI interface to make it more modular and maintainable (#802)

kotlin-api-examples/test_offline_asr.kt

@@ -0,0 +1,32 @@
+package com.k2fsa.sherpa.onnx
+
+fun main() {
+  val recognizer = createOfflineRecognizer()
+
+  val waveFilename = "./sherpa-onnx-streaming-zipformer-en-20M-2023-02-17/test_wavs/0.wav"
+
+  val objArray = WaveReader.readWaveFromFile(
+      filename = waveFilename,
+  )
+  val samples: FloatArray = objArray[0] as FloatArray
+  val sampleRate: Int = objArray[1] as Int
+
+  val stream = recognizer.createStream()
+  stream.acceptWaveform(samples, sampleRate=sampleRate)
+  recognizer.decode(stream)
+
+  val result = recognizer.getResult(stream)
+  println(result)
+
+  stream.release()
+  recognizer.release()
+}
+
+fun createOfflineRecognizer(): OfflineRecognizer {
+  val config = OfflineRecognizerConfig(
+      featConfig = getFeatureConfig(sampleRate = 16000, featureDim = 80),
+      modelConfig = getOfflineModelConfig(type = 2)!!,
+  )
+
+  return OfflineRecognizer(config = config)
+}