Add ProxyFactoryCustomizer

Allows manipulating the `ProxyFactory` before the proxy is created

See gh-36225

Signed-off-by: Đặng Minh Dũng <dungdm93@live.com>

spring-web/src/test/java/org/springframework/web/service/invoker/HttpServiceProxyFactoryTests.java

@@ -16,9 +16,9 @@
 
 package org.springframework.web.service.invoker;
 
+import org.aopalliance.intercept.MethodInterceptor;
 import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.Test;
-
 import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.web.service.annotation.GetExchange;
 
@@ -44,6 +44,18 @@ public class HttpServiceProxyFactoryTests {
 	}
 
 
+	@Test
+	void proxyFactoryCustomizer() {
+		var mi = (MethodInterceptor) invocation -> "intercepted";
+		var factory = HttpServiceProxyFactory.builderFor(mock(HttpExchangeAdapter.class))
+				.proxyCustomizer((fact, serviceType) -> {
+					fact.addAdvice(0, mi);
+				}).build();
+
+		var service = factory.createClient(Service.class);
+		assertThat(service.execute()).isEqualTo("intercepted");
+	}
+
 	private interface Service {
 
 		@GetExchange