feat(newlib): add picolibc support

components/newlib/platform_include/stdio_ext.h

@@ -0,0 +1,14 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include "sdkconfig.h"
+
+#if CONFIG_LIBC_NEWLIB
+#include_next <stdio_ext.h>
+#else
+#include <stdio-bufio.h>
+#endif