addKspDependency

Add a KSP dependency to the given target.

Once done, this means that KSP will process this project, using the KSP processor whose coordinates are set in the project's KobwebBlock.kspProcessorDependency property.

In order for this to work, you must first call applyKspPlugin for the project.

You do not need to call this method if you already called setupKspJs or setupKspJvm, as those will call this as a side effect.