Add support for logging audit events for package installs as per OSPP v4.2
    
    If enabled at build-time, log audit events for package install, update
    and remove. The log includes the operation, package nevra, signature
    check result, whether signatures are being enforced enforced and overall
    success result. Package install/update/remove are logged as such,
    obsoletion is logged as install + remove (whereas the erasure element
    on updates is silent)
    
    Loosely based on initial RHEL 7-8 implementations by Pavlina Moravcova
    Varekova and Florian Festi (RhBug:1555326, RhBug:1607612)
    
    (cherry picked from commit cfc9dde70fe65e91c83e03e9a9441e627b741489)