Add support for repositories running on Sonatype Nexus Repository - NuGet Proxies

[madpah]

Support for NuGet Proxy Repositories on Sonatype Nexus Repository is not trivial due to case sensitivity challenges.

PURLs are CASE SENSITIVE, alas Windows (eco-systems) are CASE INSENSITIVE. Thus Sonatype Nexus Repository catalogues components canonicalising names to lowercase.

For example: https://www.nuget.org/packages/Azure.Core/1.33.0

• Correct Package URL (PURL): pkg:nuget/Azure.Core@1.33.
• Sonatype Nexus Repository Manager stored the asset as name azure.core, which results in a PURL of pkg:nuget/azure.core@1.33

This means we cannot accurately derive the PURL for a NuGet package when browsing Sonatype Nexus Repository Manager.

ucwords cannot be employed to resolve this due to examples such as https://www.nuget.org/packages/Microsoft.CSharp/4.6.0

FYI @maurycupitt

[maurycupitt]

@madpah - Maybe take the hash to get the purl then query again with the purl?

[github-actions]

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