Introduce `@ConcurrencyLimit` annotation based on `ConcurrencyThrottleInterceptor`

[jhoeller]

Following up on @Retryable in #34529, we are considering a related feature for throttling method invocations: namely, a @ConcurrencyLimit annotation based on our good old ConcurrencyThrottleInterceptor arrangement (dating back to 1.0) which has recently been revised for use with SimpleAsyncTaskExecutor in Virtual Threads mode (#34727).

Since both @Retryable and @ConcurrencyLimit are effectively resilience features for method invocations, it is attractive to combine them into an org.springframework.resilience package in the spring-context module (next to org.springframework.scheduling which features @Scheduling and @Async) rather than keeping the retry interceptor in org.springframework.aop.retry. The goal is to unify these efforts for 7.0 M7.