cl: keep stmt comments

[CarlJi]

Refer #1864

This PR only fixes a portion of the scenarios, and there are still other TODO items that need to be handled, like:

• go+ overload function comments
• keep comments when no need add fileLine
• do format for the generated code to adheres to the standard Go coding style

I will continue to follow up on these tasks in separate PRs.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 63.39%. Comparing base (5e44bc4) to head (40fd0c4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1870      +/-   ##
==========================================
+ Coverage   62.64%   63.39%   +0.75%     
==========================================
  Files         141      141              
  Lines       20584    20600      +16     
==========================================
+ Hits        12894    13060     +166     
+ Misses       7351     7203     -148     
+ Partials      339      337       -2     

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