Publish allopen compiler plugin separately

- added also 'kotlin-allopen-compiler-plugin-embeddable' to be used with
  'kotlin-compiler-embeddable'
- 'kotlin-maven-allopen' now just depends on
  'kotlin-allopen-compiler-plugin' instead of "embeding" it into itself

^KT-52811 In Progress

libraries/tools/kotlin-allopen/build.gradle.kts

@@ -15,8 +15,6 @@ dependencies {
 
     commonCompileOnly(project(":kotlin-compiler-embeddable"))
     commonCompileOnly(project(":kotlin-allopen-compiler-plugin"))
-
-    embedded(project(":kotlin-allopen-compiler-plugin")) { isTransitive = false }
 }
 
 gradlePlugin {

libraries/tools/kotlin-allopen/src/common/kotlin/org/jetbrains/kotlin/allopen/gradle/AllOpenSubplugin.kt

@@ -33,7 +33,7 @@ class AllOpenGradleSubplugin
             return project.extensions.getByType(AllOpenExtension::class.java)
         }
 
-        private const val ALLOPEN_ARTIFACT_NAME = "kotlin-allopen"
+        private const val ALLOPEN_ARTIFACT_NAME = "kotlin-allopen-compiler-plugin-embeddable"
 
         private const val ANNOTATION_ARG_NAME = "annotation"
         private const val PRESET_ARG_NAME = "preset"