json:change length type from uint16_t to size_t

[ZhouBox]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 11.11111% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.17%. Comparing base (db1c5ad) to head (f28b03d).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/utils/json.c	13.33%	13 Missing ⚠️
src/parser/neu_json_rw.c	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2841       +/-   ##
===========================================
+ Coverage   41.66%   65.17%   +23.51%     
===========================================
  Files         126      132        +6     
  Lines       30444    32139     +1695     
===========================================
+ Hits        12684    20948     +8264     
+ Misses      17760    11191     -6569     

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