Introduce new Gradle plugin org.jetbrains.kotlin.js

This is the Gradle plugin that does not rely on the
Java model and uses the same Kotlin model
(target – compilation – source set) as MPP does.

Also add JS DCE support for this plugin.

Issue #KT-5756 Fixed
Issue #KT-13256 Fixed
Issue #KT-16355 Fixed
Issue #KT-20156 Fixed
Issue #KT-29284 Fixed

libraries/tools/kotlin-gradle-plugin/build.gradle.kts

@@ -128,6 +128,11 @@ pluginBundle {
         id = "org.jetbrains.kotlin.jvm",
         display = "Kotlin JVM plugin"
     )
+    create(
+        name = "kotlinJsPlugin",
+        id = "org.jetbrains.kotlin.js",
+        display = "Kotlin JS plugin"
+    )
     create(
         name = "kotlinMultiplatformPlugin",
         id = "org.jetbrains.kotlin.multiplatform",