Enable pinvoke source generation in netstandard2.0 project

### Type of issue

Missing information

### Description

I would like to know if and how the source generation for platform invokes can be used in a netstandard2.0 project using .net 7 SDK. Are there any runtime dependencies for this feature, is there a NuGet package for netstandar2.0 projects or can some sources be added to the own project to make the generator work?

### Page URL

https://learn.microsoft.com/en-us/dotnet/standard/native-interop/pinvoke-source-generation

### Content source URL

https://github.com/dotnet/docs/blob/main/docs/standard/native-interop/pinvoke-source-generation.md

### Document Version Independent Id

572c0b50-a28d-d387-1e8c-4a271615a753

### Article author

@jkoritzinsky