Refactor ports to support product details and affinity product IDs retrieval

src/main/java/com/example/productaffinity/domain/port/outcoming/AffinityProductsIdsPort.java

@@ -1,4 +1,9 @@
 package com.example.productaffinity.domain.port.outcoming;
 
-public class AffinityProductsIdsPort {
+import reactor.core.publisher.Mono;
+
+import java.util.Collection;
+
+public interface AffinityProductsIdsPort {
+    Mono<Collection<String>> findAffinityProductIds(String productId);
 }

src/main/java/com/example/productaffinity/domain/port/outcoming/ProductDetailsPort.java

@@ -1,9 +1,10 @@
 package com.example.productaffinity.domain.port.outcoming;
 
+import com.example.productaffinity.domain.model.Product;
 import reactor.core.publisher.Mono;
 
 import java.util.Collection;
 
 public interface ProductDetailsPort {
-    Mono<Collection<String>> findAffinityProductIds(String productId);
+    Mono<Product> findProductDetail(String productId);
 }