Support sending metadata to group/adapter resources for `securityContext`

[michaeltlombardi]

Summary of the new feature / enhancement

As a resource developer, I want to be able to design my resource to receive metadata about the operation from DSC so that I don't need to implement similar context retrieval myself. For example, if DSC can indicate the current security context, I can rely on that information for fast-failing an operation.

While I'm specifically discussing securityContext for this issue, this functionality likely holds for other metadata fields that currently exist and may be added later.

Proposed technical implementation details (optional)

No response