Implement Go language binding (#1196)

Implement Go binding APIs of runtime, module and instance
Add sample, build scripts and update the document

Co-authored-by: venus-taibai <97893654+venus-taibai@users.noreply.github.com>

language-bindings/go/samples/wasm-app/build.sh

@@ -0,0 +1,32 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+WAMR_DIR=${PWD}/../../..
+
+echo "Build wasm app .."
+/opt/wasi-sdk/bin/clang -O3 \
+        -z stack-size=4096 -Wl,--initial-memory=65536 \
+        -o test.wasm main.c \
+        -Wl,--export=main -Wl,--export=__main_argc_argv \
+        -Wl,--export=fib2 \
+        -Wl,--export=test1 \
+        -Wl,--export=test2 \
+        -Wl,--export=test3 \
+        -Wl,--export=test4 \
+        -Wl,--export=__data_end -Wl,--export=__heap_base \
+        -Wl,--strip-all,--no-entry \
+        -Wl,--allow-undefined \
+        -nostdlib \
+
+echo "Build binarydump tool .."
+rm -fr build && mkdir build && cd build
+cmake ../../../../../test-tools/binarydump-tool
+make
+cd ..
+
+echo "Generate test_wasm.h .."
+./build/binarydump -o test_wasm.h -n wasm_test_file test.wasm
+
+rm -fr build
+
+echo "Done"

language-bindings/go/samples/wasm-app/main.c

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+unsigned
+fib2(unsigned n)
+{
+    if (n < 2) {
+        return 1;
+    }
+    return fib2(n - 2) + fib2(n - 1);
+}
+
+void
+test1(int32_t i32, int64_t i64, float f32, double f64)
+{
+    printf("i32: %d, i64: %lld, f32: %f, f64: %f\n", i32, i64, f32, f64);
+}
+
+int64_t
+test2(int64_t x, int64_t y)
+{
+    printf("%lld + %lld = %lld\n", x, y, x + y);
+    return x + y;
+}
+
+double
+test3(float x, double y)
+{
+    printf("%f * %f = %f\n", x, y, x * y);
+    return x * y;
+}
+
+float
+test4(double x, int32_t y)
+{
+    printf("%f / %d = %f\n", x, y, x / y);
+    return x / y;
+}
+
+int
+main(int argc, char **argv)
+{
+    char *buf;
+
+    printf("Hello world!\n");
+
+    buf = malloc(1024);
+    if (!buf) {
+        printf("malloc buf failed\n");
+        return -1;
+    }
+
+    printf("buf ptr: %p\n", buf);
+
+    snprintf(buf, 1024, "%s", "1234\n");
+    printf("buf: %s", buf);
+
+    free(buf);
+    return 0;
+}