[Assign plugin] Add a compiler plugin for overloading assign ('=') operator

plugins/assign-plugin/assign-plugin.common/build.gradle.kts

@@ -0,0 +1,20 @@
+description = "Kotlin Assignment Compiler Plugin (Common)"
+
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
+
+dependencies {
+    compileOnly(project(":compiler:util"))
+    compileOnly(project(":core:compiler.common"))
+}
+
+sourceSets {
+    "main" { projectDefault() }
+    "test" { none() }
+}
+
+runtimeJar()
+javadocJar()
+sourcesJar()

plugins/assign-plugin/assign-plugin.common/src/org/jetbrains/kotlin/assignment/plugin/AssignmentPluginNames.kt

@@ -0,0 +1,14 @@
+/*
+ * Copyright 2010-2022 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.assignment.plugin
+
+import org.jetbrains.kotlin.name.Name
+
+object AssignmentPluginNames {
+    const val PLUGIN_ID = "org.jetbrains.kotlin.assignment"
+    const val ANNOTATION_OPTION_NAME = "annotation"
+    val ASSIGN_METHOD = Name.identifier("assign")
+}