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 {