introduce a type for the stateless reset key

[marten-seemann]

Just accepting a byte slice is a dangerous API. Using a single byte (say) for a stateless reset key is not very secure - an attacker could trivially bruteforce the stateless reset token. Using a 32 byte key is arbitrary, but seems like a reasonable key size.

[codecov]

Codecov Report

Base: 85.49% // Head: 85.49% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (f9a25b0) compared to base (7b211d6).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3621   +/-   ##
=======================================
  Coverage   85.49%   85.49%           
=======================================
  Files         142      142           
  Lines       10294    10295    +1     
=======================================
+ Hits         8800     8801    +1     
  Misses       1109     1109           
  Partials      385      385           

Impacted Files	Coverage Δ
interface.go	0.00% <ø> (ø)
multiplexer.go	94.44% <100.00%> (ø)
packet_handler_map.go	72.48% <100.00%> (+0.11%)	⬆️

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