qlog: support new StatelessResetToken type

[LPardue]

The qlog specs recently landed a change to separate out StatelessResetToken into its own type, that is distinct from https://github.com/quicwg/qlog/commit/c2a302d9bf9b97c36e264ff1db42c14aa6e6705e.

This updates the data and quiche, which simplifies some of the logging code where we handle stateless resets tokens