feat: Create +ResultTypes for Swift again as we now use C++ types

[mrousavy]

Wraps all results of Swift functions in a Name_method_Result type that looks like this:

@frozen
public enum HybridSwiftKotlinTestObjectSpecCxx_callCallback_Result {
  case successful(Double)
  case failure(error: String)
}

This way we catch errors and propagate them to C++ safely, as a throw in Swift cannot be caught in C++ but instead would crash the entire app.

The problem is now that this won't build tho...