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/workflows/macos.yaml

@@ -84,7 +84,13 @@ jobs:
             BUILD_SHARED_LIBS=ON
           fi
 
-          cmake -DSHERPA_ONNX_ENABLE_TTS=${{ matrix.with_tts }} -D BUILD_SHARED_LIBS=$BUILD_SHARED_LIBS -D CMAKE_BUILD_TYPE=${{ matrix.build_type }} -DCMAKE_OSX_ARCHITECTURES='arm64;x86_64' -DCMAKE_INSTALL_PREFIX=./install ..
+          cmake \
+            -DSHERPA_ONNX_ENABLE_TTS=${{ matrix.with_tts }} \
+            -D BUILD_SHARED_LIBS=$BUILD_SHARED_LIBS \
+            -D CMAKE_BUILD_TYPE=${{ matrix.build_type }} \
+            -D CMAKE_OSX_ARCHITECTURES='arm64;x86_64' \
+            -D CMAKE_INSTALL_PREFIX=./install \
+            ..
 
       - name: Build sherpa-onnx for macos
         shell: bash