Introduce @ConcurrencyLimit annotation based on ConcurrencyThrottleInterceptor

Moves @retryable infrastructure to resilience package in spring-context module.
Includes duration parsing and placeholder resolution for @retryable attributes.
Provides convenient @EnableResilientMethods for @retryable + @ConcurrencyLimit.

Closes gh-35133
See gh-34529

Author: jhoeller

spring-aop/src/main/java/org/springframework/aop/framework/autoproxy/AbstractBeanFactoryAwareAdvisingPostProcessor.java

@@ -41,7 +41,7 @@
 public abstract class AbstractBeanFactoryAwareAdvisingPostProcessor extends AbstractAdvisingBeanPostProcessor
 		implements BeanFactoryAware {
 
-	private @Nullable ConfigurableListableBeanFactory beanFactory;
+	protected @Nullable ConfigurableListableBeanFactory beanFactory;
 
 
 	@Override

spring-aop/src/main/java/org/springframework/aop/interceptor/ConcurrencyThrottleInterceptor.java

@@ -44,10 +44,24 @@
 public class ConcurrencyThrottleInterceptor extends ConcurrencyThrottleSupport
 		implements MethodInterceptor, Serializable {
 
+	/**
+	 * Create a default {@code ConcurrencyThrottleInterceptor}
+	 * with concurrency limit 1.
+	 */
 	public ConcurrencyThrottleInterceptor() {
-		setConcurrencyLimit(1);
+		this(1);
 	}
 
+	/**
+	 * Create a default {@code ConcurrencyThrottleInterceptor}
+	 * with the given concurrency limit.
+	 * @since 7.0
+	 */
+	public ConcurrencyThrottleInterceptor(int concurrencyLimit) {
+		setConcurrencyLimit(concurrencyLimit);
+	}
+
+
 	@Override
 	public @Nullable Object invoke(MethodInvocation methodInvocation) throws Throwable {
 		beforeAccess();