Refactor unknown message decoding

[bradleyjkemp]

No description provided.

[codecov]

Codecov Report

Merging #30 into master will decrease coverage by 0.91%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   16.32%   15.41%   -0.92%     
==========================================
  Files           6        6              
  Lines         294      266      -28     
==========================================
- Hits           48       41       -7     
+ Misses        240      219      -21     
  Partials        6        6

Impacted Files	Coverage Δ
grpc-proxy/proxy.go	0% <0%> (ø)	⬆️
internal/peekconn/peeker.go	58.62% <0%> (+11.56%)	⬆️

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