fix: correct some bugs and add feature of backend config for optimize subcommand

[Maxing1997]

Details

There are some bugs in optimize subcommand, following bugs are fixed in this patchset:

• read chunk from wrong blob
• missing extended table in new bootstrap
• hardlink is broken in new image
• missing blobinfo updates
• wrong chunk align for fs-version 5

By the way, implement the backend config support for optimize subcommand, thus we can read chunk on-demand during build process.

Types of changes

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

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] 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)

[codecov[bot]]

Codecov Report

:x: Patch coverage is 0% with 246 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 59.85%. Comparing base (f60e40a) to head (55e36f6). :warning: Report is 48 commits behind head on master.

Files with missing lines	Patch %	Lines
builder/src/optimize_prefetch.rs	0.00%	170 Missing :warning:
src/bin/nydus-image/main.rs	0.00%	53 Missing :warning:
contrib/nydusify/cmd/nydusify.go	0.00%	23 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1661      +/-   ##
==========================================
- Coverage   60.05%   59.85%   -0.21%     
==========================================
  Files         147      147              
  Lines       49624    49790     +166     
  Branches    47078    47222     +144     
==========================================
- Hits        29802    29800       -2     
- Misses      18040    18207     +167     
- Partials     1782     1783       +1     

Files with missing lines	Coverage Δ
builder/src/lib.rs	63.15% <ø> (ø)
contrib/nydusify/cmd/nydusify.go	13.11% <0.00%> (-0.41%)	:arrow_down:
src/bin/nydus-image/main.rs	0.58% <0.00%> (-0.01%)	:arrow_down:
builder/src/optimize_prefetch.rs	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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[imeoer]

Can we add a usage in docs/nydusify.md for the nydusify optimize command?

[imeoer]

Can we add a usage in docs/nydusify.md for the nydusify optimize command?

Hi @Maxing1997, plz help move forward with merging this PR if you have time. :)

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity.

[github-actions[bot]]

This PR was closed because it has been stalled for 7 days with no activity.

[Maxing1997]

@imeoer Hi, can you reopen this pr, I have adapt the prefetch_files to json format。