support @ConditionalOnProperty in property navigation feature

[martinlippert]

As a follow-up from #761, we should also support navigating to the property definition locations when using @ConditionalOnProperty, for example @ConditionalOnProperty("petclinic.s1.message")

Also consider navigating to property defined by prefix and name:
@ConditionalOnProperty(prefix = "notification", name = "service")

[BoykoAlex]

@martinlippert shouldn't be a problem at all. I'd try to sneak this into 4.18.1 Monday night.

[BoykoAlex]

Fixed with 85103b6