fix: reuse underlying HttpClient in toBlocking()

DefaultJdkHttpClient.toBlocking() now constructs JdkBlockingHttpClient via
the existing AbstractJdkHttpClient prototype copy constructor sharing the
underlying java.net.http.HttpClient

Author: naborka

http-client-jdk/src/main/java/io/micronaut/http/client/jdk/DefaultJdkHttpClient.java

@@ -145,21 +145,7 @@ private static MediaTypeCodecRegistry createDefaultMediaTypeRegistry() {
 
     @Override
     public BlockingHttpClient toBlocking() {
-        return new JdkBlockingHttpClient(
-            loadBalancer,
-            httpVersion,
-            configuration,
-            contextPath,
-            filterResolver,
-            clientFilterEntries,
-            mediaTypeCodecRegistry,
-            messageBodyHandlerRegistry,
-            requestBinderRegistry,
-            clientId,
-            conversionService,
-            sslBuilder,
-            cookieDecoder
-        );
+        return new JdkBlockingHttpClient(this);
     }
 
     @Override

http-client-jdk/src/main/java/io/micronaut/http/client/jdk/JdkBlockingHttpClient.java

@@ -44,6 +44,9 @@
 @Internal
 @Experimental
 public class JdkBlockingHttpClient extends AbstractJdkHttpClient implements BlockingHttpClient {
+    JdkBlockingHttpClient(AbstractJdkHttpClient prototype) {
+        super(prototype);
+    }
 
     public JdkBlockingHttpClient(
         LoadBalancer loadBalancer,