[Parcelize] Remove dependency from backend module to k2 module

This is needed to avoid dependencies on FIR classes inside Parcelize IDE
  plugin

plugins/parcelize/parcelize-compiler/parcelize.common/src/org/jetbrains/kotlin/parcelize/fir/ParcelizePluginKey.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.parcelize.fir
+
+import org.jetbrains.kotlin.GeneratedDeclarationKey
+
+object ParcelizePluginKey : GeneratedDeclarationKey() {
+    override fun toString(): String {
+        return "FirParcelize"
+    }
+}