feat: Preserve original file permissions & Default copy permissions c…

[wlynxg]

1. DefaultPermCopy permissions changed to 755, 777 permission is too great;
2. CopyOption adds an option to copy source file permissions;
3. Added unit tests related to CopyOption.

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.01% ⚠️

Comparison is base (ef1e18d) 79.10% compared to head (c2f3fcb) 79.10%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2969      +/-   ##
==========================================
- Coverage   79.10%   79.10%   -0.01%     
==========================================
  Files         643      643              
  Lines       52749    52760      +11     
==========================================
+ Hits        41727    41735       +8     
- Misses       8942     8944       +2     
- Partials     2080     2081       +1     

Flag	Coverage Δ
go-1.18-386	79.15% <50.00%> (+0.01%)	⬆️
go-1.18-amd64	79.15% <50.00%> (+<0.01%)	⬆️
go-1.19-386	79.03% <50.00%> (-0.03%)	⬇️
go-1.19-amd64	79.02% <50.00%> (-0.02%)	⬇️
go-1.20-386	79.11% <50.00%> (-0.04%)	⬇️
go-1.20-amd64	79.15% <50.00%> (+0.07%)	⬆️
go-1.21-386	?
go-1.21-amd64	?

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Files Changed	Coverage Δ
os/gfile/gfile.go	83.62% <ø> (ø)
os/gfile/gfile_copy.go	44.13% <50.00%> (+1.93%)	⬆️

... and 2 files with indirect coverage changes

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