[wip] gop go -multi-files: option generate multi files

[visualfc]

• gop go -multi-files genarate multi files

main.gop => gop_autogen_main.go
Rect.gop => gop_autogen_Rect.go

• gop clean check gop_autogen_ prefix file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.34%. Comparing base (06a9e20) to head (89c4ea5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2005   +/-   ##
=======================================
  Coverage   93.34%   93.34%           
=======================================
  Files          42       42           
  Lines       11734    11742    +8     
=======================================
+ Hits        10953    10961    +8     
  Misses        624      624           
  Partials      157      157           

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