Build sherpa-onnx as a single shared library (#1078)

When `-D BUILD_SHARED_LIBS=ON` is passed to `cmake`, it builds a single shared library.

Specifically, 

- For C APIs, it builds `libsherpa-onnx-c-api.so`
- For Python APIs, it builds `_sherpa_onnx.cpython-xx-xx.so`
- For Kotlin and Java APIs, it builds `libsherpa-onnx-jni.so`

There is no `libsherpa-onnx-core.so` any longer.

Note it affects only shared libraries.

.github/scripts/test-dart.sh

@@ -6,17 +6,6 @@ cd dart-api-examples
 
 pushd non-streaming-asr
 
-echo '----------paraformer itn----------'
-./run-paraformer-itn.sh
-
-echo '----------paraformer----------'
-./run-paraformer.sh
-rm -rf sherpa-onnx-*
-
-echo '----------VAD with paraformer----------'
-./run-vad-with-paraformer.sh
-rm -rf sherpa-onnx-*
-
 echo '----------NeMo transducer----------'
 ./run-nemo-transducer.sh
 rm -rf sherpa-onnx-*
@@ -37,6 +26,17 @@ echo '----------zipformer transducer----------'
 ./run-zipformer-transducer.sh
 rm -rf sherpa-onnx-*
 
+echo '----------paraformer itn----------'
+./run-paraformer-itn.sh
+
+echo '----------paraformer----------'
+./run-paraformer.sh
+rm -rf sherpa-onnx-*
+
+echo '----------VAD with paraformer----------'
+./run-vad-with-paraformer.sh
+rm -rf sherpa-onnx-*
+
 popd # non-streaming-asr
 
 pushd tts