tests/net/esp_wifi_csi: Initial esp wifi csi test

tests/net/esp_wifi_csi/Makefile

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+BOARD ?= esp32-wroom-32
+
+include ../Makefile.net_common
+
+USEMODULE += esp_wifi_csi
+USEMODULE += esp_wifi_csi_metadata
+FEATURES_REQUIRED += esp_wifi
+
+include $(RIOTBASE)/Makefile.include

tests/net/esp_wifi_csi/README.md

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+ESP WIFI CSI Test
+=================
+This is simple test to show WIFI CSI (Channel State Information).
+
+To use the application specific callback, run:
+```
+CFLAGS='-DESP_WIFI_CSI_RX_CB_OVERRIDE' make
+```

tests/net/esp_wifi_csi/main.c

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+/*
+ * Copyright (C) 2023 HAW Hamburg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ *
+ * @author      Kevin Weiss <kevin.weiss@haw-hamburg.de>
+ *
+ * @}
+ */
+#ifdef ESP_WIFI_CSI_RX_CB_OVERRIDE
+#include <stdio.h>
+
+#include "esp_wifi_types.h"
+#endif
+#include "esp-wifi/esp_wifi_netdev.h"
+
+
+#ifdef ESP_WIFI_CSI_RX_CB_OVERRIDE
+void esp_wifi_csi_rx_cb(void *ctx, wifi_csi_info_t *data)
+{
+    (void)ctx;
+    printf("App WiFi CSI %p\n", data);
+}
+#endif
+
+/** the only ESP WiFi device */
+extern esp_wifi_netdev_t _esp_wifi_dev;
+
+/** setup function for the ESP WiFi */
+extern void esp_wifi_setup (esp_wifi_netdev_t* dev);
+
+int main(void)
+{
+    esp_wifi_setup(&_esp_wifi_dev);
+
+    while (1) {
+        /* do nothing */
+    }
+
+    /* should be never reached */
+    return 0;
+}