add a fuzz target for the token generator

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Merging #2730 into master will increase coverage by 0.00%.
The diff coverage is 88.89%.

@@           Coverage Diff           @@
##           master    #2730   +/-   ##
=======================================
  Coverage   86.51%   86.51%           
=======================================
  Files         126      126           
  Lines        9952     9955    +3     
=======================================
+ Hits         8609     8612    +3     
  Misses       1010     1010           
  Partials      333      333           

Impacted Files	Coverage Δ
internal/handshake/token_protector.go	58.97% <83.33%> (+3.42%)	⬆️
internal/handshake/token_generator.go	78.57% <100.00%> (ø)
server.go	83.70% <100.00%> (ø)

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