Provide a WebServer library for the UNO R4 WiFi

The "**Arduino ESP32 Boards**" and "**esp32**" platforms include a bundled library named "**WebServer**":

https://github.com/espressif/arduino-esp32/tree/3.3.0/libraries/WebServer

This library makes the implementation of an HTTP web server far more convenient than what is currently required to do the same using the "**WiFiS3**" directly.

It would be very helpful if a variant of the **WebServer** was provided for use with the UNO R4 WiFi board.

### Additional context

There is a 3rd party library:

https://github.com/cotestatnt/HTTPWebServer

#### Additional requests

- https://forum.arduino.cc/t/web-page-examples-for-esp8266-and-r4/1212426
- https://forum.arduino.cc/t/compilation-for-uno-r4-wifi-fails-webserver-h-no-such-file-or-directory/1278172

#### Related

- https://github.com/khoih-prog/WiFiWebServer (intended to provide a general purpose WebServer library, but created before the advent of the WiFiS3 library)
- https://forum.arduino.cc/t/webserver-con-websocket-integrato/1361318

Start by comparing the Arduino ESP32 WebServer library with the WiFiS3 API and the referenced HTTPWebServer implementation. Define the UNO R4 WiFi-compatible API and integration scope, then verify that the resulting library can provide HTTP web-server functionality on the board.

Written by the indexing model from the issue text.