feat(ui/img_lazyload): add support for lazy loading images in comments

[qwqcode]

Refer to: https://artalk.js.org/guide/frontend/img-lazy-load.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.60%. Comparing base (fa6648e) to head (fa0a5ec).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #850      +/-   ##
==========================================
- Coverage   27.68%   27.60%   -0.09%     
==========================================
  Files         181      181              
  Lines        7253     7253              
==========================================
- Hits         2008     2002       -6     
- Misses       5123     5127       +4     
- Partials      122      124       +2     

Flag	Coverage Δ
go	27.60% <ø> (-0.09%)	⬇️

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