[Feature]: Give users the ability to have diagnostic-level verbosity for Nuget network activity

[MattGal]

NuGet Product(s) Involved

NuGet.exe, MSBuild.exe, dotnet.exe

The Elevator Pitch

While doing the research that eventually led to #11027, I realized how little information I can actually get about network operations from Nuget Clients. This leads to all sorts of experimentation with packet captures, artificial environments, and frankly guesswork.

A flag, either that honors MSBuild verbosity in build tasks, environment variable, what-have-you, that turns on max verbosity for all network activity (or even errors) could significantly help customers debug through the problems they face. The above issue, for instance, helped find a very old deficiency that had been in Azure DevOps package feeds more-or-less forever.

Additional Context and Details

No response