Implement Java 9 module visibility checks

In this commit, only IDE tests are added, because we look for module
declarations in the IDE across the whole project, whereas in the
compiler we should do this on the module path only and that requires
separate work (KT-18599) which is done in the following commits.

(The change in Cache.kt is needed so that
JvmModuleAccessibilityChecker.ClassifierUsage, which is an inner class,
would be injected properly.)

 #KT-18598 In Progress
 #KT-18599 In Progress

idea/testData/multiModuleHighlighting/java9/simpleLibraryExportsPackage/library/dependency/J.java

@@ -0,0 +1,7 @@
+package dependency;
+
+import dependency.impl.JImpl;
+
+public class J {
+    public static JImpl getInstance() { return new JImpl(); }
+}

idea/testData/multiModuleHighlighting/java9/simpleLibraryExportsPackage/library/dependency/K.kt

@@ -0,0 +1,9 @@
+package dependency
+
+import dependency.impl.KImpl
+
+open class K {
+    companion object {
+        fun getInstance(): KImpl = KImpl()
+    }
+}

idea/testData/multiModuleHighlighting/java9/simpleLibraryExportsPackage/library/dependency/impl/JImpl.java

@@ -0,0 +1,6 @@
+package dependency.impl;
+
+import dependency.J;
+
+public class JImpl extends J {
+}

idea/testData/multiModuleHighlighting/java9/simpleLibraryExportsPackage/library/dependency/impl/KImpl.kt

@@ -0,0 +1,5 @@
+package dependency.impl
+
+import dependency.K
+
+class KImpl : K()

idea/testData/multiModuleHighlighting/java9/simpleLibraryExportsPackage/library/module-info.java

@@ -0,0 +1,3 @@
+module library {
+    exports dependency;
+}

idea/testData/multiModuleHighlighting/java9/simpleLibraryExportsPackage/main/module-info.java

@@ -0,0 +1,3 @@
+module main {
+    requires library;
+}

idea/testData/multiModuleHighlighting/java9/simpleLibraryExportsPackage/main/usage.kt

@@ -0,0 +1,16 @@
+import dependency.*
+import dependency.J
+import dependency.K
+import dependency.impl.*
+import dependency.impl.<error>JImpl</error>
+import dependency.impl.<error>KImpl</error>
+
+fun usage(): String {
+    val j: J = J.getInstance()
+    val k: K = K.getInstance()
+
+    val jImpl: <error>JImpl</error> = J.getInstance()
+    val kImpl: <error>KImpl</error> = K.getInstance()
+
+    return "$j$k$jImpl$kImpl"
+}