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/windows-x64-jni.yaml

@@ -37,7 +37,13 @@ jobs:
         run: |
           mkdir build
           cd build
-          cmake -A x64 -D CMAKE_BUILD_TYPE=Release -D BUILD_SHARED_LIBS=ON -DSHERPA_ONNX_ENABLE_JNI=ON -DCMAKE_INSTALL_PREFIX=./install ..
+          cmake \
+            -A x64 \
+            -D CMAKE_BUILD_TYPE=Release \
+            -D BUILD_SHARED_LIBS=ON \
+            -D SHERPA_ONNX_ENABLE_JNI=ON \
+            -D CMAKE_INSTALL_PREFIX=./install \
+            ..
 
       - name: Build sherpa-onnx for windows
         shell: bash