Extract Function: Support extraction of expressions in delegation

specifiers

idea/testData/refactoring/extractFunction/delegation/delegationByExpressionFull.kt.after

@@ -0,0 +1,10 @@
+// PARAM_TYPES: T
+trait T
+
+class A(a: Int, b: Int): T
+
+class B(t: T): T by t(t)
+
+fun t(t: T): T {
+    return t
+}