Add non-streaming ASR examples for Dart API (#1007)

dart-api-examples/non-streaming-asr/run-whisper.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -ex
+
+dart pub get
+
+if [ ! -f ./sherpa-onnx-whisper-tiny.en/tiny.en-tokens.txt ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-whisper-tiny.en.tar.bz2
+
+  tar xvf sherpa-onnx-whisper-tiny.en.tar.bz2
+  rm sherpa-onnx-whisper-tiny.en.tar.bz2
+fi
+
+dart run \
+  ./bin/whisper.dart \
+  --encoder ./sherpa-onnx-whisper-tiny.en/tiny.en-encoder.int8.onnx \
+  --decoder ./sherpa-onnx-whisper-tiny.en/tiny.en-decoder.int8.onnx \
+  --tokens ./sherpa-onnx-whisper-tiny.en/tiny.en-tokens.txt \
+  --input-wav ./sherpa-onnx-whisper-tiny.en/test_wavs/0.wav