Introduce Variable: Avoid explicit types for expression of anonymous type

#KT-12078 Fixed

idea/testData/refactoring/introduceVariable/AnonymousType.kt

@@ -0,0 +1,9 @@
+fun foo() {
+    bar(<selection>object: Runnable {
+        override fun run() {
+        }
+    }</selection>)
+}
+
+fun bar(runnable: Runnable) {
+}

idea/testData/refactoring/introduceVariable/AnonymousType.kt.after

@@ -0,0 +1,10 @@
+fun foo() {
+    val runnable = object : Runnable {
+        override fun run() {
+        }
+    }
+    bar(runnable)
+}
+
+fun bar(runnable: Runnable) {
+}