[GROOVY-11432] Support method references/method pointers in annotations - ASF JIRA

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Java thought it might be a good idea a while back but thought it would be hard to implement:
https://mail.openjdk.org/pipermail/core-libs-dev/2018-November/056596.html

For us we could use a Class typed annotation attribute and do like we currently do for closures, e.g.:

@interface UIColorAnnotation {
    Class method()
}
@UIColorAnnotation(method = Person::getAgeColor)
    public int getAge() {
    }
    ...

Since we already support closures, my thinking is to make the above exactly equivalent to:

@UIColorAnnotation(method = { with(Person::getAgeColor) })
    public int getAge() {
    }
    ...

links to

GitHub Pull Request #2097