During discovery, traverse links

[SteveL-MSFT]

Summary of the new feature / enhancement

Exe's published to the MSStore as msix packages have a link to the exe in PATH. However, if they are resources, then their resource manifests won't be found as they are not actually in PATH.

Proposed technical implementation details (optional)

When an exe which is a link is found, dsc should traverse the link to the home of the exe to find a resource manifest. Separately, some caching might make sense if this turns out to be too expensive.

[anmenaga]

Related issue #559 .