Implement forced script configuration reloading API for plugins

#KT-43288 fixed

libraries/scripting/intellij/src/kotlin/script/experimental/intellij/scriptConfigurationTools.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.script.experimental.intellij
+
+import com.intellij.openapi.extensions.ExtensionPointName
+import com.intellij.openapi.extensions.Extensions
+import com.intellij.psi.PsiFile
+
+/**
+ * Force reloading the script definition associated with the passed [scriptFile] in the Kotlin plugin
+ *
+ * [updateEditorWithoutNotification] controls whether the update of the indexes and highlighting of the script files
+ * based on the reloaded definition should be reloaded automatically or using notification and explicit reload action
+ */
+fun reloadScriptConfiguration(scriptFile: PsiFile, updateEditorWithoutNotification: Boolean = false) {
+    val extensions = Extensions.getArea(scriptFile.project).getExtensionPoint(IdeScriptConfigurationControlFacade.EP_NAME).extensions
+    for (extension in extensions) {
+        extension.reloadScriptConfiguration(scriptFile, updateEditorWithoutNotification)
+    }
+}
+
+/**
+ * The IntelliJ extension point needed for the [reloadScriptConfiguration] function. Should not be used directly.
+ */
+interface IdeScriptConfigurationControlFacade {
+
+    fun reloadScriptConfiguration(scriptFile: PsiFile, updateEditorWithoutNotification: Boolean = false)
+
+    companion object {
+        val EP_NAME: ExtensionPointName<IdeScriptConfigurationControlFacade> =
+            ExtensionPointName.create("org.jetbrains.kotlin.ideScriptConfigurationControlFacade")
+    }
+}