SpringBoot Allow support for @ConditionalOnProperty negation

Adding @ConditionalOnProperty negation would be useful.

Use case: @ConditionalOnProperty(name = "spring.cache.type", notHavingValue = "NONE") or @ConditionalOnProperty(name = "spring.cache.type", havingValue = "NONE", negated = true) to match when cache is enabled.

Comment From: snicoll

Thanks for the suggestion but this was already raised on a few occasions and declined. #4938 has some more context as why we're not keen to do that.

Back to your example, the example above would not give you a confident result that cache is enabled as you may have this property in this environment and configure the CacheManager yourself.