[AA Standalone] Provide workaround entry point for low memory watcher…

… shutdown

- Dokka cannot call `shutdownApplicationScheduledExecutorService` on its
  own, so a Standalone endpoint is required.
- This endpoint is just a workaround, so it's likely to change in the
  near future. The issue requires proper design.

^KT-71862

analysis/analysis-api-standalone/src/org/jetbrains/kotlin/analysis/api/standalone/StandaloneAnalysisAPISessionBuilder.kt

@@ -13,6 +13,7 @@ import com.intellij.openapi.project.Project
 import com.intellij.openapi.util.Disposer
 import com.intellij.psi.PsiFile
 import com.intellij.psi.search.GlobalSearchScope
+import com.intellij.util.concurrency.AppExecutorUtil
 import org.jetbrains.kotlin.analysis.api.KaExperimentalApi
 import org.jetbrains.kotlin.analysis.api.platform.KotlinPlatformSettings
 import org.jetbrains.kotlin.analysis.api.platform.declarations.KotlinAnnotationsResolverFactory
@@ -263,3 +264,22 @@ public inline fun buildStandaloneAnalysisAPISession(
         classLoader
     ).apply(init).build()
 }
+
+/**
+ * Disposes global resources which would persist after unloading Analysis API and IJ platform classes.
+ *
+ * **Important:** Once this function has been called, Analysis API *and* IntelliJ platform classes should not be used anymore. The classes
+ * should either be unloaded or the whole program should be shut down.
+ *
+ * You don't need to use this endpoint right before your program shuts down. The purpose of this function is rather to dispose global
+ * resources which would persist after unloading Analysis API and IJ platform classes. For example, an IJ platform class may be registered
+ * with a JDK class. If Analysis API & IJ platform classes are unloaded, this global registration may keep alive the old class loader.
+ *
+ * Note: Everything in Standalone is experimental, but this endpoint is likely to change in the *near future*. Please consult with the
+ * Analysis API team if you want to use this. (We'll want to know about your use case.)
+ */
+@Suppress("UnstableApiUsage")
+@KaExperimentalApi
+public fun disposeGlobalStandaloneApplicationServices() {
+    AppExecutorUtil.shutdownApplicationScheduledExecutorService()
+}