add support for QUIC v1

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Merging #3160 (6b771df) into master (b8f07c7) will decrease coverage by 0.05%.
The diff coverage is 53.85%.

@@            Coverage Diff             @@
##           master    #3160      +/-   ##
==========================================
- Coverage   85.43%   85.38%   -0.05%     
==========================================
  Files         132      132              
  Lines        9824     9831       +7     
==========================================
+ Hits         8393     8394       +1     
- Misses       1058     1063       +5     
- Partials      373      374       +1     

Impacted Files	Coverage Δ
http3/server.go	67.51% <28.57%> (-0.87%)	⬇️
internal/protocol/version.go	95.45% <66.67%> (-4.55%)	⬇️
internal/handshake/initial_aead.go	100.00% <100.00%> (ø)
internal/handshake/retry.go	75.00% <100.00%> (ø)
internal/handshake/tls_extension_handler.go	100.00% <100.00%> (ø)

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