Document how to create an Secure analyzer project

Problem to solve

We are missing some guidance on how to properly create an analyzer for our Category:SAST / ~"Category:Dependency Scanning" / Category:Container Scanning analyzers. We should document this similarly to how we document creation of test projects

Further details

Proposal

• Describe basic project structure
• Describe updates to docs.gitlab.com
• Describe project settings (disable issue tracker)

Who can address the issue

Other links/references