Use base64 encoding for Protobuf Handler

[blockvote]

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[codecov]

Codecov Report

Merging #10 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #10      +/-   ##
============================================
+ Coverage      80.1%   80.15%   +0.05%     
- Complexity      111      112       +1     
============================================
  Files            15       15              
  Lines           387      388       +1     
  Branches         71       71              
============================================
+ Hits            310      311       +1     
  Misses           40       40              
  Partials         37       37

Impacted Files	Coverage Δ	Complexity Δ
...io/moia/router/proto/ProtoEnabledRequestHandler.kt	100% <100%> (ø)	4 <1> (+1)	⬆️

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