feat: add fs_version and compressor output of nydus image check

[PerseidMeteor]

Relevant Issue (if applicable)

If there are Issues related to this PullRequest, please list it.

Details

1. Add fs_version value, output v5 or v6.
2. Add compressor algorithm value, like ztsd.
3. Add rafs_version and compressor JSON output of nydus image check, so that more info can be get if it is necessary.

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 0% with 46 lines in your changes are missing coverage. Please review.

Project coverage is 61.34%. Comparing base (7b3cc50) to head (6bac709).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1552      +/-   ##
==========================================
- Coverage   61.40%   61.34%   -0.07%     
==========================================
  Files         144      144              
  Lines       46962    47001      +39     
  Branches    44498    44537      +39     
==========================================
- Hits        28837    28832       -5     
- Misses      16646    16685      +39     
- Partials     1479     1484       +5     

Files	Coverage Δ
rafs/src/metadata/mod.rs	70.45% <0.00%> (-0.54%)	⬇️
src/bin/nydus-image/validator.rs	0.00% <0.00%> (ø)
src/bin/nydus-image/main.rs	0.69% <0.00%> (-0.02%)	⬇️

... and 2 files with indirect coverage changes

[imeoer]

other LGTM, thanks!

[adamqqqplay]

Thanks! Could you update the nydus-image check usage in docs/nydus-image.md ?

[imeoer]

Thanks!

[PerseidMeteor]

Thanks! Could you update the nydus-image check usage in docs/nydus-image.md ?

docs/nydus-image.md will be updated later.