Publish atomicfu compiler plugin separately

- rename plugin into 'kotlin-atomicfu-compiler-plugin'
- add 'kotlin-atomicfu-compiler-plugin-embeddable' to be used with
  'kotlin-comiler-embeddable'

^KT-52811 In Progress

libraries/tools/atomicfu/build.gradle.kts

@@ -14,8 +14,6 @@ dependencies {
 
     compileOnly(project(":kotlin-gradle-plugin"))
     compileOnly(project(":kotlin-compiler-embeddable"))
-
-    embedded(project(":kotlinx-atomicfu-compiler-plugin")) { isTransitive = false }
 }
 
 gradlePlugin {

libraries/tools/atomicfu/src/common/kotlin/org/jetbrains/kotlinx/atomicfu/gradle/AtomicfuKotlinGradleSubplugin.kt

@@ -16,7 +16,6 @@
 
 package org.jetbrains.kotlinx.atomicfu.gradle
 
-import org.gradle.api.GradleException
 import org.gradle.api.Project
 import org.gradle.api.provider.Provider
 import org.jetbrains.kotlin.gradle.plugin.*
@@ -26,7 +25,7 @@ private const val EXTENSION_NAME = "atomicfuCompilerPlugin"
 class AtomicfuKotlinGradleSubplugin :
     KotlinCompilerPluginSupportPlugin {
     companion object {
-        const val ATOMICFU_ARTIFACT_NAME = "atomicfu"
+        const val ATOMICFU_ARTIFACT_NAME = "kotlin-atomicfu-compiler-plugin-embeddable"
     }
 
     override fun apply(target: Project) {