[Example] Move the Edgehog setup before Astarte device start

[harlem88]

Move from the example the edgehog_device_new function before the astarte_device_start function, this also prevents publication of data before publishing the Astarte introspection.

edgehog-esp32-device/examples/edgehog_app/main/main.c

Line 151 in 93bad61

edgehog_device_telemetry_config_t telemetry_config
        = { .type = EDGEHOG_TELEMETRY_SYSTEM_STATUS, .period_seconds = 3600 };

    edgehog_device_config_t edgehog_conf = { .astarte_device = astarte_device,
        .partition_label = "nvs",
        .telemetry_config = &telemetry_config,
        .telemetry_config_len = 1 };
    edgehog_device = edgehog_device_new(&edgehog_conf);

    if (!edgehog_device) {
        ESP_LOGE(TAG, "Failed to create Edgehog device");
        return;
    }
    
    ...
    
     if (astarte_device_start(astarte_device) != ASTARTE_OK) {
        ESP_LOGE(TAG, "Failed to start astarte device");
        return;
    }