Add installation of threat campaigns package

[rafwegv]

Proposed changes

Threat campaigns is a highly accurate signature type that focuses on current known threat campaigns. It lives in a separate package and is controlled by enabling/disabling a violation see: https://docs.nginx.com/nginx-app-protect/configuration/#violations

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto master
• I will ensure my PR is targeting the master branch and pulling from my branch from my own fork

[pleshakov]

👍

[Rulox]

lgtm