Add simple configuration for broad targets with compatibility rules

[rjmholt]

Currently, the PSSA compatibility rules can only specify targets by name or path.

Compatibility target names are long, unintelligible and cumbersome.

Instead, users need to be able to do things like specify a list of PowerShell versions to target or a list of operating systems.

There needs to be a systematic, composable, human-readable way to specify these settings all the way from "everything" to "PowerShell 6.1 on Linux AND PowerShell 5.1 on Windows only".

While this resembles .NET RIDs, those form a simple lattice where the whole RID refers only to a granularity of operating system. A PowerShell platform can differ in operating system, PowerShell version, .NET version, .NET edition, machine architecture and process architecture (in decreasing order of importance).