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fix(udp): handle multiple datagrams through gro
Previously `Socket::recv` would at most return a single `Datagram` (i.e. `-> Result<Option<Datagram>, io::Error>`). When supported by the OS, the underlying `quinn-udp` can use both recvMmsg and GRO, each with the ability to return one or more datagrams. As of today, `neqo_common::udp` does not make use of recvmmsg, i.e. it only provides a single `IoSliceMut` to write into. That said, that single `IoSliceMut` might contain multiple `Datagram`s through GRO. Previously this would have been provided as a single `Datagram` to the caller of `Socket::recv`. This commit makes sure to handle the case where many `Datagram`s are retrieved via GRO (see `meta.stride` flag). It updates `neqo_common::udp::Socket::recv` and `neqo-server` and `neqo-client` accordingly.
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