feat: --validate-output-json to output validation result as JSON

[TrueBrain]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 23.80952% with 16 lines in your changes missing coverage. Please review.

Project coverage is 83.39%. Comparing base (a3536ce) to head (577fcd7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
truewiki/validate.py	15.38%	11 Missing ⚠️
truewiki/__main__.py	37.50%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #536      +/-   ##
==========================================
- Coverage   83.62%   83.39%   -0.23%     
==========================================
  Files          52       52              
  Lines        2785     2795      +10     
  Branches      434      437       +3     
==========================================
+ Hits         2329     2331       +2     
- Misses        343      351       +8     
  Partials      113      113              

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