Analyze Data Flow: Support properties with custom accessors

#KT-11994 In Progress

idea/testData/slicer/inflow/getterAndSetterUsingField.kt

@@ -0,0 +1,14 @@
+// FLOW: IN
+
+class A(var b: Boolean) {
+    var foo: Int
+        get() = if (b) field else 0
+        set(value) {
+            field = if (b) value else 0
+        }
+
+    fun test() {
+        val x = <caret>foo
+        foo = 1
+    }
+}