jextract/jni: Overloads with protocol parameters generate duplicate adapter classes #946

Problem

With enableJavaCallbacks enabled, JNI extraction emits a protocol-parameter adapter for each function declaration. Overloads with the same function name, parameter name, and enclosing type can require the same adapter, so the generated Swift contains duplicate class declarations and fails to compile.

Example

Both initializers below generate an adapter with the same name for store:

public protocol Store {
  func value() -> Int64
}

public struct Client {
  public init(store: some Store) {}
  public init(store: some Store, extra: Int64) {}
}

The duplicate adapter declarations cause the generated Swift to fail compilation. The same problem can occur with overloaded instance methods and free functions.

Reference workaround implementation: qoncept#9