add S3 board (#6518)

package/package_esp32_index.template.json

@@ -28,6 +28,9 @@
             {
               "name": "ESP32-S2 Dev Board"
             },
+            {
+              "name": "ESP32-S3 Dev Board"
+            },
             {
               "name": "ESP32-C3 Dev Board"
             }