Allow us to access 'cache name' property from ReqShieldCache (or AsyncCache)

When using Caffeine Cache, we load the Cache corresponding to a cache name from the `CaffeineCacheManager` and perform operations such as `get` and `put`.
* https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/cache/caffeine/CaffeineCacheManager.html#getCache(java.lang.String)
It should be possible to access the name property in `ReqShieldCache` (or `AsyncCache` in WebFlux/Coroutine environments).

Additional Question)
Should `ReqShieldCache` and `AsyncCache` have different interface names?