KT-38027 Support Code Vision feature in Kotlin // experimental status

Feature received "experimental" status due to the low performance.
The root cause is slow find-usages functionality the feature is based
on. Once the later is improved Code-Vision should be revisited.

Previous commit of KT-38027 series contains production ready state.

To launch performance check again one needs to enable Code Vision in
AbstractPerformanceProjectsTest.setUp() with the following fun:

private fun enabledCodeVision() {
  val codeVisionProvider = KotlinCodeVisionProvider()
  val settings = codeVisionProvider.createSettings().apply {
     showUsages = true
     showInheritors = true
  }

  InlayHintsSettings.instance().storeSettings(codeVisionProvider.key,
   KotlinLanguage.INSTANCE, settings)
}

idea/resources/META-INF/extensions/ide.xml

@@ -147,6 +147,16 @@
                      defaultValue="true"
                      restartRequired="false"/>
 
+        <registryKey key="kotlin.code-vision.usages"
+                     description="Enable Code-Vision usages search"
+                     defaultValue="false"
+                     restartRequired="false"/>
+
+        <registryKey key="kotlin.code-vision.inheritors"
+                     description="Enable Code-Vision inheritors search"
+                     defaultValue="false"
+                     restartRequired="false"/>
+
         <fileEditorProvider implementation="org.jetbrains.kotlin.idea.scratch.ui.KtScratchFileEditorProvider"/>
 
         <moduleBuilder builderClass="org.jetbrains.kotlin.tools.projectWizard.wizard.NewProjectWizardModuleBuilder"/>