Invoke default methods in dynamic proxies automatically

## Overview

See #28491 for background information.

In JDK dynamic proxies created by Spring AOP, we could potentially introduce support for automatically invoking default methods (or make it easier via a utility).

## Available Java APIs

- `java.lang.reflect.Method.isDefault()`
- `java.lang.reflect.InvocationHandler.invokeDefault(Object, Method, Object...)`

