Reworked asset comparison

[mmitche]

The idea here was to rewrite the asset comparison in C# (with a little help from CoPilot), and rework into stages:

1. Map the non-VMR assets to VMR assets.
2. Analyze the mapping
3. Write results

I also took advantage of a few key bits of functionality in arcade:

• The nuget info generator to get version information (vs. trying to extract from the file name)
• The version identifier for blobs, so that we can strip version information from the path, then attempt to find a file matching the stripped name in the VMR assets.

In the second phase, I started with the existing tests, but we can move the other tests (comparing NuGet content) over here. Those are also written in C# so it should be simpler.

I also changed the output to an xml file, with entries corresponding to mappings, and lists of issues.