Added socket send and recv timeout options (#1419)

Added socket send and recv timeout options with implementation for posix platform.

This is part of a extending support for sockets in WASI. #1336.

Also add sample that sets and reads back the send and receive timeouts using
the native function binding.

core/shared/platform/windows/win_socket.c

@@ -209,6 +209,38 @@ os_socket_addr_local(bh_socket_t socket, uint8_t *buf, size_t buflen,
     return BHT_ERROR;
 }
 
+int
+os_socket_set_send_timeout(bh_socket_t socket, uint64 timeout_us)
+{
+    errno = ENOSYS;
+
+    return BHT_ERROR;
+}
+
+int
+os_socket_get_send_timeout(bh_socket_t socket, uint64 *timeout_us)
+{
+    errno = ENOSYS;
+
+    return BHT_ERROR;
+}
+
+int
+os_socket_set_recv_timeout(bh_socket_t socket, uint64 timeout_us)
+{
+    errno = ENOSYS;
+
+    return BHT_ERROR;
+}
+
+int
+os_socket_get_recv_timeout(bh_socket_t socket, uint64 *timeout_us)
+{
+    errno = ENOSYS;
+
+    return BHT_ERROR;
+}
+
 int
 os_socket_addr_remote(bh_socket_t socket, uint8_t *buf, size_t buflen,
                       uint16_t *port, uint8_t *is_ipv4)