Fix missing targets file issue in some C++ nuget packages

[hanagasira]

What does this PR do?

Projects using the C++ nuget package import the targets file packages\\{package_id}.{version}\\build\\native\\{package_id}.targets is imported,
but there are some packages that have .targets files in other locations or need to import .props files other than .targets.

Example.

The targets file for the WinPixEventRuntime package targets file exists in
packages\WinPixEventRuntime.1.0.220810001\build\WinPixEventRuntime.targets. not
packages\WinPixEventRuntime.1.0.220810001\build\native\WinPixEventRuntime.targets.

Microsoft.Direct3D.D3D12 package needs to import
packages\Microsoft.Direct3D.D3D12.1.608.2\build\native\Microsoft.Direct3D.D3D12.props file as well as
packages\Microsoft.Direct3D.D3D12.1.608.2\build\native\Microsoft.Direct3D.D3D12.targets file.

How does this PR change Premake's behavior?

• Create packageAPIInfo.packageEntries variable for package nuget even when it is not a C# project
• In a project using the nuget package, look for .props and .targets files in the packageAPIInfo.packageEntries variable and import them.

Anything else we should know?

May slow down project generation to search for targets and props files.

Closes #1497

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• Focus on a single fix or feature; remove any unrelated formatting or code changes
• Add unit tests showing fix or feature works; all tests pass
• Mention any related issues (put closes #XXXX in comment to auto-close issue when PR is merged)
• Follow our coding conventions
• Minimize the number of commits
• Align documentation to your changes

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[nickclark2016]

Does this work with C# nuget packages still?

[hanagasira]

Yes, I have confirmed that I can build my project using the nuget package in C#

[GloriousPtr]

Thanks for this, works like charm, no wonky workarounds with PIX and Agility sdk copying files at wrong locations.
Hope to see it merge soon.