Build: Migrate plugin markers to maven-publish publication

libraries/tools/kotlin-serialization/build.gradle

@@ -38,4 +38,6 @@ pluginBundle {
             description = displayName = 'Kotlin compiler plugin for kotlinx.serialization library'
         }
     }
-}
+}
+
+configurePluginMarkers(project)

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

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