qlog draft-02 fixes

[marten-seemann]

• log the packet_size in the raw.length
• always log the packet_type in the header

[codecov]

Codecov Report

Merging #2987 (f28db16) into master (d1c5297) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2987      +/-   ##
==========================================
+ Coverage   86.12%   86.13%   +0.01%     
==========================================
  Files         135      135              
  Lines        9379     9387       +8     
==========================================
+ Hits         8077     8085       +8     
  Misses        943      943              
  Partials      359      359              

Impacted Files	Coverage Δ
qlog/event.go	97.83% <100.00%> (+0.07%)	⬆️
qlog/packet_header.go	95.83% <100.00%> (+0.18%)	⬆️
qlog/qlog.go	94.63% <100.00%> (ø)

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