qlog the packet_type as part of the packet header, not the event itself

[marten-seemann]

See quicwg/qlog@0cb1f02.

[codecov]

Codecov Report

Merging #2758 (4f55731) into master (5a0ce24) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2758      +/-   ##
==========================================
- Coverage   86.24%   86.23%   -0.01%     
==========================================
  Files         133      133              
  Lines        9143     9138       -5     
==========================================
- Hits         7885     7880       -5     
  Misses        910      910              
  Partials      348      348              

Impacted Files	Coverage Δ
qlog/event.go	97.60% <ø> (-0.06%)	⬇️
qlog/packet_header.go	94.87% <100.00%> (+0.13%)	⬆️
qlog/qlog.go	95.63% <100.00%> (-0.03%)	⬇️

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