Support for HTTP/3 (server side)

[dtaivpp]

Is your feature request related to a problem? Please describe.
HTTP/3 is in the works and as a project it would be in our best interest to support it out of the gate. As of this moment the spec has not been finalized however many major websites are already rolling it out.

HTTP/3 uses UDP as its underlying protocol and allows for the unblocking of packets in the instance of failures. It is also more tightly coupled with TLS making for more secure connections.

Describe the solution you'd like
We should begin working on an HTTP/3 implementation with netty.

Describe alternatives you've considered
If we don't support it no one would probably notice but being ahead of the curve gives us a lot of credibility.

Additional context
RFC 9114 - HTTP/3
Netty Sample HTTP/3 Implementation

[reta]

With #14804 being merged, we could move on to support HTTP/3

[dtaivpp]

@reta bold of you to label with 3.4.0 :P This would be really exciting

[reta]

@reta bold of you to label with 3.4.0 :P This would be really exciting

Fingers crossed @dtaivpp ! :-D

[reta]

Moving to 3.5.0, too many unforeseen issues