feat(report) : display diff status (--diff-plus, --diff-minus option added to report and tui)

[kazuminn]

./vuls tui -diff

./vuls report -format-list -diff

./vuls report -format-full-text -diff

./vuls report -format-one-line-text -diff

This patch has the function to output the resolved(patched) CVEs compared to the previous JSON.

--diff option turns on both options -diff-plus and -diff-minus

Document pull request : vulsdoc/vuls#140

Type of change

Please delete options that are not relevant.

• 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 not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

Checklist:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES

[kotakanbe]

Thanks, I reviewed it