PR Summary

Fixes AB#1886304 - Fixes #1721 - Add metadata to docs

Added metadata needed for publishing to docs.microsoft.com, including an ms.custom value to track the version of PSSA. The description metadata value is taken from the CommonName property of the rule.

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.