Introduce Property: Initial support (properties with getter)

idea/testData/refactoring/introduceProperty/extractWithGetterMultipleExpressions.kt.after

@@ -0,0 +1,15 @@
+// EXTRACTION_TARGET: property with getter
+class A {
+    fun foo(): Int {
+        val b = i
+        val c = b - 1
+    }
+
+    private val i: Int
+        get() {
+            val a = 1 + 2
+            val b = a * 2
+            return b
+        }
+}
+