Define common set of Policy conditions and reasons

[robscott]

What would you like to be added:
As part of our policy attachment model, we've defined a standard way of referencing Policies and a recommended structure for all Policy resources. It seems like the natural next step would be to define a set of Conditions that we recommend setting on policy resources to enable more generic tooling to parse different kinds of policies.

Why this is needed:
This will help ensure the status of custom policies can be understood by generic tooling.

[robscott]

Thanks to @mmamczur for working on this one