HTTP/3 API and implementation #5756
                
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Implementation of HTTP API with HTTP/3.
This implementation makes use of Vert.x Quic stream implementation.
Todo
Breaking changes
Implementing HTTP/3 implies a few potential breaking changes, the strategy to handle them will be on a case by case basis and attempt to minimize the amount of breaking changes to delay them until Vert.x 6 is implemented, here is a non exhaustive list:
H2/H3 discrepancies
Shutdown / GoAway
H2
GoAwaycarries stream id + error code + debug dataH3
GoAwayonly carries stream id, but quic can close with an error code + reason data, error code seems similar but reason is not the same semantic than debug.