Create marker for Gradle Plugin Portal for kotlinx-serialization compiler plugin

#KT-27612 fixed

libraries/configureGradleTools.gradle

@@ -1,5 +1,5 @@
 
-configure([project(':kotlin-gradle-plugin'), project(':kotlin-allopen'), project(':kotlin-noarg')]) { project ->
+configure([project(':kotlin-gradle-plugin'), project(':kotlin-allopen'), project(':kotlin-noarg'), project(':kotlin-serialization')]) { project ->
     apply plugin: 'com.gradle.plugin-publish'
 
     afterEvaluate {

libraries/tools/kotlin-serialization/build.gradle

@@ -35,3 +35,12 @@ artifacts {
 }
 
 javadocJar()
+
+pluginBundle {
+    plugins {
+        kotlinSerialization {
+            id = 'org.jetbrains.kotlin.plugin.serialization'
+            description = displayName = 'Kotlin compiler plugin for kotlinx.serialization library'
+        }
+    }
+}

libraries/tools/kotlin-serialization/plugin-marker/build.gradle

@@ -0,0 +1,3 @@
+apply from: "$rootDir/libraries/tools/gradle-tools/pluginMarkers.gradle"
+
+pluginMarkerProject('kotlin-serialization')