IO: support populate fds into WASM application (#655)

Add new API wasm_runtime_set_wasi_args_ex to support populate stdio fds

Signed-off-by: LiFeng <lifeng68@huawei.com>

core/iwasm/interpreter/wasm_runtime.c

@@ -1483,6 +1483,9 @@ wasm_instantiate(WASMModule *module, bool is_sub_inst,
                                     module->wasi_args.env_count,
                                     module->wasi_args.argv,
                                     module->wasi_args.argc,
+                                    module->wasi_args.stdio[0],
+                                    module->wasi_args.stdio[1],
+                                    module->wasi_args.stdio[2],
                                     error_buf, error_buf_size)) {
             goto fail;
         }