Updates to feature/egressExtension Part 1

[kkeirstead]

Summary

I closed #2748 in favor of doing an even more limited set of changes. A couple of notes:

• A large chunk of the changes is moving logging statements from the dotnet-monitor project to the Azure Blob Storage project in preparation for completely separating them.
• The majority of newly introduced files are copies from within dotnet-monitor and don't need to be re-reviewed (unless there's a concern with the way the file was originally written).
• To keep the changes smaller, I've eliminated some refactoring that has already been completed in my personal feature branch - as a result, there are some code paths/variables in this PR that are not being exercised.

Release Notes Entry