Update publishing and usage of kotlin-annotation-processing plugin

- removed 'kotlin-annotation-processing-gradle' publication as it
duplicated 'kotlin-annotation-processing-embeddable'
- removed 'kotlin-annotation-processing-maven' as it is embedded into
  'kotlin-maven-plugin'. Instead 'kotlin-maven-plugin' now depends on
  'kotlin-annotation-processing' directly.

^KT-52811 In Progress

plugins/kapt3/kotlin-annotation-processing-embeddable/build.gradle.kts

@@ -0,0 +1,15 @@
+description = "Annotation Processor for Kotlin (for using with embeddable compiler)"
+
+plugins {
+    `java-library`
+}
+
+dependencies {
+    embedded(project(":kotlin-annotation-processing")) { isTransitive = false }
+}
+
+publish()
+
+runtimeJar(rewriteDefaultJarDepsToShadedCompiler())
+sourcesJar()
+javadocJar()