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')

settings.gradle

@@ -212,7 +212,8 @@ include ":kotlin-build-common",
         ":kotlinx-serialization-compiler-plugin",
         ":kotlinx-serialization-ide-plugin",
         ":kotlin-serialization",
-        ":kotlin-serialization-unshaded"
+        ":kotlin-serialization-unshaded",
+        ":kotlin-serialization:plugin-marker"
 
 
 def includeCidr = hasProperty("cidrPluginsEnabled") && Boolean.parseBoolean(cidrPluginsEnabled)
@@ -247,7 +248,7 @@ if (flags.inJpsBuildIdeaSync) {
     // modules that we are currently cannot compile with jps
     include ":kotlin-idl2k"
     project(':kotlin-idl2k').projectDir = file("$rootDir/libraries/tools/idl2k")
-    
+
     include ":core:builtins",
             ":kotlin-stdlib-common",
             ":kotlin-stdlib",
@@ -392,6 +393,7 @@ project(':kotlinx-serialization-compiler-plugin').projectDir = file("$rootDir/pl
 project(':kotlinx-serialization-ide-plugin').projectDir = file("$rootDir/plugins/kotlin-serialization/kotlin-serialization-ide")
 project(':kotlin-serialization').projectDir = file("$rootDir/libraries/tools/kotlin-serialization")
 project(':kotlin-serialization-unshaded').projectDir = file("$rootDir/libraries/tools/kotlin-serialization-unshaded")
+project(':kotlin-serialization:plugin-marker').projectDir = file("$rootDir/libraries/tools/kotlin-serialization/plugin-marker")
 
 // Uncomment to use locally built protobuf-relocated
 // includeBuild("dependencies/protobuf")