[WIP] Provide a migration path from ESPAsyncWebServer (PoC)

[mathieucarbou]

This PR is a PoC for #110

Project PR	Status	Components	Comment
mathieucarbou/MycilaESPConnect#25	🚧	Filter, HTTP
https://github.com/mathieucarbou/MycilaWebSerial	🚧	Filter, Websocket (text based)	High streaming rate of log lines of random length
https://github.com/ayushsharma82/WebSerial	🚧	Filter, Websocket (binary based)	High streaming rate of log lines of random length
https://github.com/ayushsharma82/ElegantOTA	🚧	Filter, HTTP
https://github.com/ayushsharma82/ESP-DASH	🚧	Filter, Websocket (text based)	Potentially big messages, high send rate for real-time dashboards

🚧: WIP or TODO
✅: Done and tested
❌: Blocked or not possible

I do not have any event source example (I don't like event source lol) so someone will have to contribute this part.

[hoeken]

I think I see what you're going for here and I'm open to it.

Can you explain a bit more about why you changed from by pointer to by reference? My C++ is a bit rusty in this area. Is it to make the syntax more similar to ESPAsync?