Convert KotlinImporterComponent into a module service

Relates to #KT-38407

idea/idea-maven/src/org/jetbrains/kotlin/idea/maven/KotlinImporterComponentCompat.kt

@@ -0,0 +1,13 @@
+/*
+ * 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.maven
+
+import com.intellij.openapi.module.Module
+import org.jetbrains.kotlin.idea.util.application.getServiceSafe
+
+// BUNCH: 192
+internal val Module.kotlinImporterComponent: KotlinImporterComponent
+    get() = this.getServiceSafe()

idea/idea-maven/src/org/jetbrains/kotlin/idea/maven/KotlinImporterComponentCompat.kt.192

@@ -0,0 +1,12 @@
+/*
+ * 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.maven
+
+import com.intellij.openapi.module.Module
+
+// BUNCH: 192
+internal val Module.kotlinImporterComponent: KotlinImporterComponent
+    get() = getComponent(KotlinImporterComponent::class.java) ?: throw IllegalStateException("No maven importer state configured")

idea/idea-maven/src/org/jetbrains/kotlin/idea/maven/KotlinMavenImporter.kt

@@ -417,7 +417,4 @@ class KotlinImporterComponent : PersistentStateComponent<KotlinImporterComponent
     override fun getState(): State {
         return State(addedSources.sorted())
     }
-}
-
-private val Module.kotlinImporterComponent: KotlinImporterComponent
-    get() = getComponent(KotlinImporterComponent::class.java) ?: throw IllegalStateException("No maven importer state configured")
+}

idea/idea-maven/test/org/jetbrains/kotlin/idea/maven/KotlinMavenImporterTest.kt

@@ -3036,7 +3036,7 @@ class KotlinMavenImporterTest : MavenImportingTestCase() {
     }
 
     private fun assertImporterStatePresent() {
-        assertNotNull("Kotlin importer component is not present", myTestFixture.module.getComponent(KotlinImporterComponent::class.java))
+        assertNotNull("Kotlin importer component is not present", myTestFixture.module.kotlinImporterComponent)
     }
 
     private fun facetSettings(moduleName: String) = KotlinFacet.get(getModule(moduleName))!!.configuration.settings