[Kotlin Project Model] Add compiler plugin support

libraries/tools/kotlin-gradle-plugin-api/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/GradleKpmCompilerPlugin.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.plugin.mpp.pm20
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.jetbrains.kotlin.project.model.*
+
+/**
+ * Gradle plugin that provides [KpmCompilerPlugin] from applied [Project]
+ */
+interface GradleKpmCompilerPlugin : Plugin<Project> {
+    val kpmCompilerPlugin: KpmCompilerPlugin
+}

libraries/tools/kotlin-gradle-plugin-api/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/KotlinGradleModule.kt

@@ -13,6 +13,7 @@ import org.gradle.api.Project
 import org.jetbrains.kotlin.gradle.plugin.HasKotlinDependencies
 import org.jetbrains.kotlin.gradle.plugin.KotlinDependencyHandler
 import org.jetbrains.kotlin.project.model.KotlinModule
+import org.jetbrains.kotlin.project.model.KpmCompilerPlugin
 
 interface KotlinGradleModule : KotlinModule, Named, HasKotlinDependencies {
     val project: Project
@@ -23,6 +24,8 @@ interface KotlinGradleModule : KotlinModule, Named, HasKotlinDependencies {
     // TODO DSL & build script model: find a way to create a flexible typed view on fragments?
     override val variants: NamedDomainObjectSet<KotlinGradleVariant>
 
+    override val plugins: Set<KpmCompilerPlugin>
+
     val isPublic: Boolean
 
     fun ifMadePublic(action: () -> Unit)