scripting: preload scripting support plugins

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/ScriptConfigurationManager.kt

@@ -62,6 +62,8 @@ class IdeScriptDependenciesProvider(project: Project) : ScriptDependenciesProvid
  * of opened files when configuration will be loaded or updated.
  */
 interface ScriptConfigurationManager {
+    fun loadPlugins()
+
     /**
      * Get cached configuration for [file] or load it.
      * May return null even configuration was loaded but was not yet applied.

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/ScriptDefinitionsManager.kt

@@ -68,6 +68,7 @@ class LoadScriptDefinitionsStartupActivity : StartupActivity {
         } else {
             executeOnPooledThread {
                 ScriptDefinitionsManager.getInstance(project).reloadScriptDefinitionsIfNeeded()
+                ScriptConfigurationManager.getInstance(project).loadPlugins()
             }
         }
     }

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/configuration/CompositeScriptConfigurationManager.kt

@@ -65,6 +65,10 @@ class CompositeScriptConfigurationManager(val project: Project) : ScriptConfigur
         }
     }
 
+    override fun loadPlugins() {
+        plugins
+    }
+
     fun tryGetScriptDefinitionFast(locationId: String): ScriptDefinition? {
         return classpathRoots.getLightScriptInfo(locationId)?.definition
     }