Enhancement for "join declaration and assignment": now can handle also local variables, relevant inspection added #KT-12095 Fixed

idea/testData/intentions/joinDeclarationAndAssignment/propertyReassignment.kt.after

@@ -0,0 +1,8 @@
+class C {
+    var s<selection>: Int</selection><caret> = 1
+
+    init {
+        s.hashCode()
+        s = 2
+    }
+}