Command for generation of EOL annotation data file

[NikolaMilosavljevic]

Contributes to https://github.com/dotnet/docker-tools/issues/1201

Opening this PR as a draft. There are some areas that could use a little more cleanup and refactoring.

This work adds a new command, with related tests, for generation of EOL annotation data file.

The command is doing the following:

• Compares old and new image-info files to determine which digests should be marked for EOL
• Utilizes Microsoft.Deployment.DotNet.Releases library to determine EOL dates of .NET products and use them in annotations of images and platforms
• Queries Azure event log telemetry to detect any 'dangling' digests - i.e. those that are present in ACR but were never added to image-info files

Pipeline work, to enable annotation of EOL digests is not present in this PR. That work isn't complex, however it is incomplete and untested. Shared in https://github.com/NikolaMilosavljevic/docker-tools/pull/new/pipeline.eol.annotations

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[mthalman]

@dagood - Be aware that we're adding a dependency on Azure Logs Workspace here that contains the ACR events. That would be necessary to configure in order to support EOL annotations.