feat(esp_eth): a new folder structure of the driver and other improvements

Fixed memory leak in emac_esp_new_dma function.

Polished ESP EMAC cache management.

Added emac_periph definitions based on SoC features and improved(generalized) ESP EMAC GPIO
initialization.

Added ESP EMAC GPIO reservation.

Added check for frame error condition indicated by EMAC DMA and created a target test.

examples/protocols/http_server/async_handlers/main/main.c

@@ -36,7 +36,7 @@
 
 static const char *TAG = "example";
 
-// Async reqeusts are queued here while they wait to
+// Async requests are queued here while they wait to
 // be processed by the workers
 static QueueHandle_t async_req_queue;