Add tooling documentation for Tools.Common, StaticAnalysis, and CI Filter

[cormacpayne]

Description

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
  • the markdown help files have been regenerated using the commands listed here

[cormacpayne]

@markcowl @MiYanni @niander would you mind taking a look and reviewing this? Let me know if there's anything I missed for any of these documents.

CC: @erich-wang @isra-fel @dolauli please have a look as well and let me know if you have any questions about the documents.

[isra-fel]

@msJinLei @wyunchi-ms please also take a look at this, thanks

[markcowl]

One minor correction, otherwise, this is fantastic documentation

[markcowl]

Thanks, I didn't even think about this, but this is important to know.