Extraction Engine: Support lazy properties and properties with initializer

idea/testData/refactoring/introduceProperty/extractWithInitializerAndSingleElementBlock.kt

@@ -0,0 +1,12 @@
+// EXTRACTION_TARGET: property with initializer
+
+class A(val n: Int = 1) {
+    val m: Int = 2
+
+    fun foo(): Int {
+        return if (n > 1) <selection>{
+            m + n + 1
+        }</selection> else 0
+    }
+}
+