feat(output): show package view for container scanning table result

[hogo6002]

Fixes #1315

For container scanning, instead of listing hundreds of vulnerabilities, the output now shows the affected packages.

Changes:

• Added a summary listing the number of affected packages and vulnerabilities, including severity counts and the number of fixable vulnerabilities.
• Grouped results by ecosystem and source.
• Added a prompt message to inform users about the HTML and vertical output options.

Future Plans (to be implemented after the comprehensive layer and base image information are available):

• Add a layer info summary.
• Add base image information.

Sample output:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.77465% with 3 lines in your changes missing coverage. Please review.

Project coverage is 69.51%. Comparing base (5e82cf7) to head (662715d). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/output/table.go	94.73%	1 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1407 +/- ## ========================================== + Coverage 69.05% 69.51% +0.46% ========================================== Files 186 186 Lines 18237 18326 +89 ========================================== + Hits 12593 12739 +146 + Misses 4965 4911 -54 + Partials 679 676 -3 ```

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