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

```diff @@ 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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