implement the HTTP/3 Datagram negotiation #2951
Merged
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Depends on #2949.
According to https://www.ietf.org/archive/id/draft-schinazi-masque-h3-datagram-02.html.
This PR only adds support for writing and parsing of the datagram option in the HTTP/3 SETTINGS frame, as well as adds the check that datagram support was enabled on the QUIC layer if both client and server negotiated it on the H3 layer.
It is not yet possible to actually send and receive H3 datagrams. That will be added in a subsequent PR.