[AAPI] Introduce PsiFile in KtNotUnderContentRootModule

Indices are not available in the IDE for files outside content roots,
and the newly introduced 'PsiFile' can be used for searching
classifiers instead.

analysis/analysis-api-standalone/src/org/jetbrains/kotlin/analysis/project/structure/impl/KtModuleProviderImpl.kt

@@ -45,7 +45,7 @@ internal class KtModuleProviderImpl(
             ?: return notUnderContentRootModuleCache.getOrPut(containingFileAsPsiFile) {
                 KtNotUnderContentRootModuleImpl(
                     moduleDescription = "Standalone-not-under-content-root-module-for-$containingFileAsPsiFile",
-                    psiFile = containingFileAsPsiFile,
+                    file = containingFileAsPsiFile,
                     project = project,
                 )
             }

analysis/analysis-api-standalone/src/org/jetbrains/kotlin/analysis/project/structure/impl/KtNotUnderContentRootModuleImpl.kt

@@ -19,12 +19,12 @@ internal class KtNotUnderContentRootModuleImpl(
     override val directRefinementDependencies: List<KtModule> = emptyList(),
     override val directFriendDependencies: List<KtModule> = emptyList(),
     override val platform: TargetPlatform = JvmPlatforms.defaultJvmPlatform,
-    psiFile: PsiFile? = null,
+    override val file: PsiFile? = null,
     override val moduleDescription: String,
     override val project: Project,
 ) : KtNotUnderContentRootModule, KtModuleWithPlatform {
     override val analyzerServices: PlatformDependentAnalyzerServices = super.analyzerServices
 
     override val contentScope: GlobalSearchScope =
-        if (psiFile != null) GlobalSearchScope.fileScope(psiFile) else GlobalSearchScope.EMPTY_SCOPE
+        if (file != null) GlobalSearchScope.fileScope(file) else GlobalSearchScope.EMPTY_SCOPE
 }

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

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.analysis.project.structure
 
 import com.intellij.openapi.project.Project
+import com.intellij.psi.PsiFile
 import com.intellij.psi.search.GlobalSearchScope
 import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.platform.TargetPlatform
@@ -170,4 +171,7 @@ public class KtBuiltinsModule(
 /**
  * A set of sources which lives outside project content root. E.g, testdata files or source files of some other project.
  */
-public interface KtNotUnderContentRootModule : KtModule
+public interface KtNotUnderContentRootModule : KtModule {
+    public val file: PsiFile?
+        get() = null
+}