add support for checking overrides for property getters/setters from Java code

[yigit]

It is not possible right now to check if a Java class overrides a field declared in interface/class.

For instance:

            interface MyInterface {
                var y:Int
            }

            class JavaImpl implements MyInterface {
                public int getY() {
                    return 1;
                }
                public void setY(int value) {
                    
                }
            }

I want to check if getY in JavaImpl overrides the getter for val y in MyInterface.
I receive JavaImpl.getYas aKSFunctionDeclarationand forval y, all I have is a KSProperty (not even KSPropertySetter since it is an interface).

Right now, KSFunctionDeclaration.overrides expects a KSFunctionDeclaration.

It could be changed into recieve KSDeclaration but that won't let me distinguish between the setter and getter. It might make sense to have overrides for KSPropertySetter/Getter as well as overridesGetter(ksProperty), overridesSetter(ksProperty).

[yigit]

btw, the java processing version of this API receives a 3rd argument as the type in which override is checked:

https://docs.oracle.com/javase/7/docs/api/javax/lang/model/util/Elements.html#overrides(javax.lang.model.element.ExecutableElement,%20javax.lang.model.element.ExecutableElement,%20javax.lang.model.element.TypeElement)

The documentation lists some edge cases where it matters.