Enable `dsc config resolve` for included configs

[SteveL-MSFT]

Summary of the new feature / enhancement

As part of https://github.com/PowerShell/DSC/issues/412 we would want to enable rendering a complete config that includes other config files. Some considerations:

• needs to be done recursively as an included config may itself include another config
• render in execution order based on dependsOn to show the sequence top to bottom
• probably expose as a new Resolve capability for Group and Adapter resources to implement

Proposed technical implementation details (optional)

No response

[michaeltlombardi]

Does it make sense for resolve to also validate the configuration by default? Should the command have a flag for skipping/enforcing validation (depending on default behavior)?

[SteveL-MSFT]

The config schema will always be validated as I imagine resolve to just be another operation like export or get