qerr: include role (remote / local) in error string representations

[marten-seemann]

This would fix libp2p/go-libp2p#1928. cc @MarcoPolo

[codecov]

Codecov Report

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

Coverage data is based on head (fd35b1b) compared to base (8d496eb).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3629   +/-   ##
=======================================
  Coverage   85.49%   85.49%           
=======================================
  Files         142      142           
  Lines       10300    10303    +3     
=======================================
+ Hits         8805     8808    +3     
  Misses       1110     1110           
  Partials      385      385           

Impacted Files	Coverage Δ
internal/handshake/crypto_setup.go	66.74% <100.00%> (ø)
internal/qerr/error_codes.go	100.00% <100.00%> (ø)
internal/qerr/errors.go	91.18% <100.00%> (+0.85%)	⬆️

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