Add FUS collector for Migration tool

idea/idea-core/src/org/jetbrains/kotlin/idea/statistics/FUSEventGroups.kt

@@ -23,7 +23,8 @@ enum class FUSEventGroups(groupIdSuffix: String, val events: Set<String> = setOf
     Editor("ide.editor"),
     Settings("ide.settings"),
     GradlePerformance("gradle.performance"),
-    NewWizard("ide.new.wizard");
+    NewWizard("ide.new.wizard"),
+    MigrationTool("ide.migrationTool");
 
     val GROUP_ID: String = "kotlin.$groupIdSuffix"
 }

idea/idea-core/src/org/jetbrains/kotlin/idea/statistics/MigrationToolFUSCollector.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.statistics
+
+object MigrationToolFUSCollector {
+
+    fun logNotification(oldVersions: Map<String, String>) {
+        KotlinFUSLogger.log(FUSEventGroups.MigrationTool, Events.Notification.toString(), oldVersions)
+    }
+
+    fun logRun() {
+        KotlinFUSLogger.log(FUSEventGroups.MigrationTool, Events.Run.toString())
+    }
+
+    enum class Events {
+        Notification, Run
+    }
+}