Complete Protobuf Encoder implementation

[Kyle-Ye]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 71.73913% with 78 lines in your changes missing coverage. Please review.

Project coverage is 19.86%. Comparing base (70fe2d9) to head (947e49f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...penSwiftUICore/Data/Protobuf/ProtobufEncoder.swift	71.73%	78 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
+ Coverage   17.36%   19.86%   +2.49%     
==========================================
  Files         223      223              
  Lines        6471     6744     +273     
==========================================
+ Hits         1124     1340     +216     
- Misses       5347     5404      +57     

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