Initial draft for @lombok.experimental.Memoizefeat/memoize

This is an initial draft for how an @Memoize annotation could look like.
It currently lacks features such as:

 - Thread safety
 - Cache invalidation
 - Soft/Weak References for a lower memory profile
 - Avoiding using a Map entirely for parameterless methods

Ideally at least some of these properties should be configurable using
flags and/or annotation properties (some users might prefer a non
thread safe cache for better performance).

Example Usage:

```java
class Test {
    int invocationCount = 0;

    public static void main(String[] args) {
        Test test = new Test();
        System.out.println(test.x(1, 2));
        System.out.println(test.x(1, 2));
        System.out.println(test.x(1, 3));
        System.out.println("Invocation Count: " + test.invocationCount);
    }

    @lombok.experimental.Memoize
    public int x(int y, int z) {
        invocationCount++;
        return y + z;
    }
}
```

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