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/linux-gpu.yaml

@@ -72,7 +72,12 @@ jobs:
 
           mkdir build
           cd build
-          cmake -D CMAKE_BUILD_TYPE=${{ matrix.build_type }} -DCMAKE_INSTALL_PREFIX=./install -DBUILD_SHARED_LIBS=ON -DSHERPA_ONNX_ENABLE_GPU=ON ..
+          cmake \
+            -D CMAKE_BUILD_TYPE=${{ matrix.build_type }} \
+            -D CMAKE_INSTALL_PREFIX=./install \
+            -D BUILD_SHARED_LIBS=ON \
+            -D SHERPA_ONNX_ENABLE_GPU=ON \
+            ..
 
       - name: Build sherpa-onnx for ubuntu
         shell: bash
@@ -86,6 +91,12 @@ jobs:
           ls -lh lib
           ls -lh bin
 
+          echo "----"
+          ls -lh install/lib
+
+          echo "----"
+          ls -lh install/bin
+
       - name: Display dependencies of sherpa-onnx for linux
         shell: bash
         run: |