Separate Microsoft.DSC metadata into directives and executionInformation

[SteveL-MSFT]

PR Summary

Separate the existing Microsoft.DSC namespace in metadata to directives and executionInformation:

• separate directives for the config doc and resources
  • config:
    • resourceDiscovery
    • securityContext
    • version (requirements form for version of DSC)
  • resource:
    • requireAdapter
    • securityContext (overrides the one defined for config is specified)
• executionInformation (for both config and resource level as-appropriate)
  • duration
  • endDatetime
  • executionType
  • operation
  • restartRequired
  • securityContext
  • startDatetime
  • version (of DSC)
  • whatIf

To not make this a breaking change, all the current returned Microsoft.DSC metadata is still there, so duplicated into executionInformation. If config uses Microsoft.DSC metadata for directives, a warning message is emitted. If both metadata and directives is used and they conflict, then an error is returned.

Since resourceDiscovery and requireAdapter were adding in 3.2-preview, removing those from Microsoft.DSC is ot a breaking change.

PR Context

Fix #1369
Fix #1343