nydusify(refactor): handle layer with retry

[BraveY]

Relevant Issue (if applicable)

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Details

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Types of changes

What types of changes does your PullRequest introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

Go over all the following points, and put an x in all the boxes that apply.

• I have updated the documentation accordingly.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 55.44%. Comparing base (c288169) to head (8219feb).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
contrib/nydusify/pkg/copier/copier.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1686      +/-   ##
==========================================
+ Coverage   55.42%   55.44%   +0.02%     
==========================================
  Files         197      197              
  Lines       55749    55754       +5     
  Branches    47176    47176              
==========================================
+ Hits        30899    30915      +16     
+ Misses      23249    23238      -11     
  Partials     1601     1601              

Files with missing lines	Coverage Δ
contrib/nydusify/pkg/external/modctl/remote.go	68.71% <100.00%> (+0.99%)	⬆️
contrib/nydusify/pkg/utils/utils.go	61.25% <100.00%> (+2.86%)	⬆️
contrib/nydusify/pkg/copier/copier.go	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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[imeoer]

Thanks!