Add test to edgehog_device

Add nvs get/set string test cases.
Add `edgehog_device_get_telemetry_type` test cases.
Add `edgehog_device_get_telemetry_periodic` test cases.
Increase WDT_TIMEOUT_MS for fixing 'Interrupt wdt timeout on CPU0'
when run test in QEMU.

Signed-off-by: Antonio Gisondi <antonio.gisondi@secomind.com>

Author: harlem88

test/app_test/main/test_main.c

@@ -1,7 +1,16 @@
 #include <unity.h>
+#include <nvs_flash.h>
+#include <nvs.h>
 
 void app_main(void)
 {
+    esp_err_t err = nvs_flash_init();
+    if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        err = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK( err );
+
     UNITY_BEGIN();
     unity_run_all_tests();
     UNITY_END();