Include other dependencies than package references

When generating an SBOM from a `.csproj` file, only `` dependencies are included in the SBOM. We are also interested in adding dependencies which are output manually, e.g.:

```

PreserveNewest

```

[A quick glance at the source code](https://github.com/CycloneDX/cyclonedx-dotnet/blob/master/CycloneDX/Services/ProjectFileService.cs#L176) shows that `GetProjectDotnetDependencyAsync()` operates on `dotnet restore`'s output in `obj/project.assets.json`, which indeed only includes nuget references.

Is there a plan to also represent such files in generated SBOMs?

Start in CycloneDX/Services/ProjectFileService.cs around GetProjectDotnetDependencyAsync() and compare its project.assets.json input with the .csproj example in the issue. Determine how manually included files such as None Include="non-nuget.dll" should be represented in generated SBOMs. Done means these dependencies are included without breaking existing PackageReference handling.

Written by the indexing model from the issue text.