MSBuilder: ThisAssembly.Metadata Information NuGet Package

This package extends MSBuilder.GenerateAssemblyInfo to also generate a static
`ThisAssembly.Metadata` class with the `@(AssemblyAttribute)` attributes that
have `Include="System.Reflection.AssemblyMetadataAttribute"`.

So for an attribute like:

[assembly: System.Reflection.AssemblyMetadataAttribute("Foo", "Bar")]

You get a corresponding `ThisAssembly.Metadata.Foo` constant with the value `Bar`.

Example:

<ItemGroup>
<AssemblyAttribute Include="System.Reflection.AssemblyMetadataAttribute">
<_Parameter1>Foo</_Parameter1>
<_Parameter2>Bar</_Parameter2>
</AssemblyAttribute>
</ItemGroup>

Generates (C#):

partial class ThisAssembly
{
public static partial class Metadata
{
public const string Foo = "Bar";
}
}

or (VB):

Namespace Global
Partial Class ThisAssembly
Partial Class Metadata
Public Const Foo = "Bar"
End Class
End Class
End Namespace.