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.

scripts/go/_internal/build_linux_amd64.go

@@ -0,0 +1,6 @@
+//go:build !android && linux && amd64 && !musl
+
+package sherpa_onnx
+
+// #cgo LDFLAGS: -L ${SRCDIR}/lib/x86_64-unknown-linux-gnu -lsherpa-onnx-c-api -lonnxruntime -Wl,-rpath,${SRCDIR}/lib/x86_64-unknown-linux-gnu
+import "C"