Add warning for time overlaps in video composition references for exporter

[CodeJhF]

为exporter添加在对视频合成的引用存在时间重叠的情况下的提示

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.26%. Comparing base (a0c34d1) to head (4bc5808).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3166      +/-   ##
==========================================
+ Coverage   77.23%   77.26%   +0.03%     
==========================================
  Files         413      413              
  Lines       21999    21999              
  Branches     6283     6201      -82     
==========================================
+ Hits        16990    16997       +7     
+ Misses       3803     3796       -7     
  Partials     1206     1206              

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