Introduce OptionalExpectationInspection

It works at INFORMATION level only and is intended to form quick-fixes
to add relevant actual declarations.

#KT-25533 Fixed

idea/testData/multiModuleQuickFix/annotationOptionalExpectation/common/common.kt

@@ -0,0 +1,11 @@
+// "Create actual annotation class for module testModule_JVM (JVM)" "true"
+// TOOL: org.jetbrains.kotlin.idea.inspections.OptionalExpectationInspection
+
+package kotlin
+
+annotation class ExperimentalMultiplatform
+annotation class OptionalExpectation
+
+@ExperimentalMultiplatform
+@OptionalExpectation
+expect annotation class <caret>Ann

idea/testData/multiModuleQuickFix/annotationOptionalExpectation/common/common.kt.after

@@ -0,0 +1,11 @@
+// "Create actual annotation class for module testModule_JVM (JVM)" "true"
+// TOOL: org.jetbrains.kotlin.idea.inspections.OptionalExpectationInspection
+
+package kotlin
+
+annotation class ExperimentalMultiplatform
+annotation class OptionalExpectation
+
+@ExperimentalMultiplatform
+@OptionalExpectation
+expect annotation class <caret>Ann

idea/testData/multiModuleQuickFix/annotationOptionalExpectation/jvm/Ann.kt

@@ -0,0 +1 @@
+// Ann: to be implemented

idea/testData/multiModuleQuickFix/annotationOptionalExpectation/jvm/Ann.kt.after

@@ -0,0 +1,5 @@
+package kotlin
+
+// Ann: to be implemented
+actual
+annotation class Ann