Use `getDeclaredClass` on `Enum`

[tkoeppe]

I don't know Java well, so I'd just like to leave this as a suggestion, without judgement:

Our static analysis suggests a change at https://github.com/qmx/jitescript/blob/master/src/main/java/me/qmx/jitescript/VisibleAnnotation.java#L34, to change value.getClass() to value.getDeclaredClass(). The former returns some derived class for enums that declare methods, whereas the latter returns the actual enum type.

I'm not sure if that's correct, but it was flagged as an error-prone pattern.