Single packet number space used for all packet types

[NErinola]

Tested Build
v1.2.0

Observation
We observed that the aioquic implementation uses a single packet number space for Initial, Handshake, 0-RTT, and 1-RTT packets. While this issue does not result in an immediate vulnerability, it deviates from the standard. According to RFC 9000 (https://www.rfc-editor.org/rfc/rfc9000.html#name-packet-numbers), separate packet number spaces should be used: one for Initial packets, another for Handshake packets, and a third shared space for both 0-RTT and 1-RTT packets.

[github-actions]

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