Summary of the new feature / enhancement

As a user, I want to be able to simply allow certain resource instances to be skipped based on the metadata securityContext. With the condition implemented now, it would be neat if it could check the securityContext directly without the need to introduce a parameter.

Proposed technical implementation details (optional)

Something like:

$schema: https://aka.ms/dsc/schemas/v3/bundled/config/document.json
metadata:
  Microsoft.DSC:
    securityContext: elevated
resources:
- name: test
  type: Microsoft.DSC.Debug/Echo
  condition: "[equals([metadata('Microsoft.DSC').securityContext], True)]"
  properties:
      output: "This should only run if the user is elevated or root"