AA: expose library modules in the project structure

analysis/project-structure/src/org/jetbrains/kotlin/analysis/project/structure/ProjectStructureProvider.kt

@@ -13,6 +13,12 @@ public abstract class ProjectStructureProvider {
      * For a given [PsiElement] get a [KtModule] to which [PsiElement] belongs.
      */
     public abstract fun getKtModuleForKtElement(element: PsiElement): KtModule
+
+    /**
+     * Returns all [KtLibraryModule]s in this project.
+     */
+    // TODO: We rather need a session or facade that maintains this information.
+    public abstract fun getKtLibraryModules(): Collection<KtLibraryModule>
 }
 
 /**
@@ -37,4 +43,4 @@ public inline fun <reified M : KtModule> PsiElement.getKtModuleOfType(project: P
  * @param project [Project] which contains current [PsiElement]. `PsiElement.project` may be a heavy operation as it includes PSI tree traversal. So, when a [Project] is  already available, it is better to pass it explicitly
  */
 public inline fun <reified M : KtModule> PsiElement.getKtModuleOfTypeSafe(project: Project = this.project): M? =
-    getKtModule(project) as M?
+    getKtModule(project) as M?