Policy descriptions: add recommendation description and documentation links

[mikouaj]

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Description

As GKE Policy Automation user, I would like to see recommended actions and documentation links for any violated policy, so I will be able to promptly address the issue.

The idea is to enhance existing policy metadata with:

• Recommendations: string describing recommended actions to solve the problem.
• List of URLs to the web pages with additional information about the issue and solution (i.e. feature documentation, best practices docs)

The metadata can be then used in JSON output, Security Command Center and possibly console output (with verbosity in mind).

• [ ] #126
• [ ] #126
• [ ] Add new policy fields to Security Command Center output

References

N/A