feat(proto): implement Stringer for IPv{4,6}

[ernado]

No description provided.

[codecov]

Codecov Report

Merging #18 (c852ee2) into main (f323d41) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   79.18%   79.20%   +0.01%     
==========================================
  Files         105      105              
  Lines        4233     4237       +4     
==========================================
+ Hits         3352     3356       +4     
  Misses        711      711              
  Partials      170      170              

Impacted Files	Coverage Δ
proto/ipv4.go	100.00% <100.00%> (ø)
proto/ipv6.go	100.00% <100.00%> (ø)

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