KT-12852 Support breadcrumbs for Kotlin

#KT-12852 Fixed

idea/testData/codeInsight/breadcrumbs/When.kt

@@ -0,0 +1,39 @@
+fun foo() {
+    when {
+        else -> {
+            when (x) {
+                x.isSomethingLong() -> {
+                    when (y) {
+                        y.isSomething() -> {
+                            when (z) {
+                                is VeryVeryVeryVeryLongName -> {
+                                    when (xxx) {
+                                        SomeEnum.SomeLongValue -> {
+                                            when (yyy) {
+                                                !in Int.MIN_VALUE..Int.MAX_VALUE -> {
+                                                    when (zzz) {
+                                                        is A, is B -> {
+                                                            when (x1) {
+                                                                A.VeryVeryVeryLongName, A.ShortName -> {
+                                                                    when (y1) {
+                                                                        is VeryVeryVeryVeryLongClassName, is ShortName -> {
+                                                                            <caret>
+                                                                        }
+                                                                    }
+                                                                }
+                                                            }
+                                                        }
+                                                    }
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}