Group metadata services under one namespace for nuget packages

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⚓ Problem

We have many services with <prefix>Metadata<suffix>Service in Packages->Nuget. This is a sign that we need a Packages::Nuget::Metadata namespace. It's so easy to get lost with so many Metadata related services flying around.

🚀 Solution

Group all metadata related services under one Packages::Nuget::Metadata namespace and modify their names accordingly.

So Packages::Nuget::ExtractMetadataFileService should be -> Packages::Nuget::Metadata::ExtractFileService