JSON wireformat fixes

[tatethurston]

Fixes #39

[codecov]

Codecov Report

Attention: 497 lines in your changes are missing coverage. Please review.

Comparison is base (383d9c5) 30.53% compared to head (e574eee) 32.36%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   30.53%   32.36%   +1.82%     
==========================================
  Files           7        8       +1     
  Lines        1575     2308     +733     
  Branches      519      808     +289     
==========================================
+ Hits          481      747     +266     
- Misses       1094     1561     +467     

Files	Coverage Δ
e2e/serialization/message.pb.ts	82.07% <92.30%> (+0.39%)	⬆️
...ages/protoscript/src/codegen/autogenerate/index.ts	2.16% <2.88%> (+0.08%)	⬆️
e2e/serialization/json.pb.ts	39.93% <39.93%> (ø)

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