Update schema to include trimming-related properties & item types

Update [`src/MSBuild/MSBuild)/Microsoft.Build.CommonTypes.xsd`](https://github.com/dotnet/msbuild/tree/main/src/MSBuild/MSBuild/Microsoft.Build.CommonTypes.xsd) with the [various options and item types used for trimming](https://docs.microsoft.com/en-us/dotnet/core/deploying/trimming/trimming-options), so that they show up in the MSBuild file editor in Visual Studio, e.g.:

- ``
- ``
- ``
- ``
- ``
- ``
- ``
- ``
- ``
- ``
- ``
- ``
- ``
- [more](https://docs.microsoft.com/en-us/dotnet/core/deploying/trimming/trimming-options#trimming-framework-library-features)

@agocke