shared heap: Fix some issues and add basic unit test case (#3801)

Fix some issues and add basic unit test case for shared heap feature.

Signed-off-by: wenlingyun1 <wenlingyun1@xiaomi.com>

tests/unit/shared-heap/wasm-apps/test.c

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2024 Xiaomi Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include <stdio.h>
+
+extern void *
+shared_malloc(int size);
+extern void
+shared_free(void *offset);
+
+int
+test()
+{
+    int *ptr = (int *)shared_malloc(10);
+
+    *ptr = 10;
+    int a = *ptr;
+    shared_free(ptr);
+    return a;
+}