use the new, streaming-friendly NDJSON-based qlog encoding

[marten-seemann]

See https://quiclog.github.io/internet-drafts/draft02/draft-marx-qlog-main-schema.html#name-qlog-to-ndjson-mapping.

[codecov]

Codecov Report

Merging #2736 (dd93d96) into master (5a0ce24) will decrease coverage by 0.02%.
The diff coverage is 72.22%.

@@            Coverage Diff             @@
##           master    #2736      +/-   ##
==========================================
- Coverage   86.24%   86.22%   -0.02%     
==========================================
  Files         133      133              
  Lines        9143     9132      -11     
==========================================
- Hits         7885     7874      -11     
+ Misses        910      909       -1     
- Partials      348      349       +1     

Impacted Files	Coverage Δ
qlog/qlog.go	94.78% <58.33%> (-0.89%)	⬇️
qlog/event.go	98.81% <100.00%> (+1.15%)	⬆️
qlog/trace.go	90.00% <100.00%> (-1.30%)	⬇️

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