fix: correctly map project target framework

[fortmarek]

When mapping a target framework from a different project, we would incorrectly default to a .target framework dependency. To fix this, we are constructing a map of target names to a ProjectNativeTarget – a helper struct that contains the necessary models we need to return a TargetDependency.project.

Additionally, we are now reading buildSettings of a given target framework to derive the linkingStatus.