fix(gen): do not generate JSON encoders for Fields type

[tdakkota]

No description provided.

[codecov]

Codecov Report

Merging #624 (c80f5a4) into main (9368956) will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #624      +/-   ##
==========================================
+ Coverage   68.98%   69.15%   +0.17%     
==========================================
  Files         400      400              
  Lines       18690    18690              
==========================================
+ Hits        12893    12925      +32     
+ Misses       4958     4921      -37     
- Partials      839      844       +5     

Impacted Files	Coverage Δ
internal/mtproto/read.go	56.46% <0.00%> (-4.77%)	⬇️
internal/rpc/engine.go	74.57% <0.00%> (-2.83%)	⬇️
telegram/updates/state.go	51.28% <0.00%> (+2.56%)	⬆️
telegram/updates/internal/e2e/server.go	71.53% <0.00%> (+6.15%)	⬆️
telegram/updates/state_channel.go	52.83% <0.00%> (+7.07%)	⬆️
telegram/updates/update.go	71.42% <0.00%> (+61.90%)	⬆️

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