FIR: add getter visibility and setter return type checks

compiler/fir/analysis-tests/testData/resolve/extendedCheckers/RedundantVisibilityModifierChecker.kt

@@ -75,7 +75,7 @@ open class J {
     }
 
     var buf = 0
-        private get() = 42
+        <!GETTER_VISIBILITY_DIFFERS_FROM_PROPERTY_VISIBILITY!>private<!> get() = 42
         protected set(value) {
             field = value
         }