Introduce Variable: Support destructuring declarations

#KT-6262

idea/testData/refactoring/introduceVariable/multiDeclarations/notOperators.kt.after

@@ -0,0 +1,8 @@
+class A
+
+fun A.component1() = 1
+fun A.component2() = 2
+
+fun test() {
+    val a = A()
+}