Publish embedded package for releases of Element Call

Part of https://github.com/element-hq/element-call/issues/2994

This PR:

- Publishes embedded builds as Tarball, NPM, AAR, SwiftPM for releases
- Publishes full builds as Tarball for releases
- Adds comments to release notes with the built artifact locations

embedded/android/settings.gradle

@@ -0,0 +1,18 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ * For more detailed information on multi-project builds, please refer to https://docs.gradle.org/8.6/userguide/multi_project_builds.html in the Gradle documentation.
+ * This project uses @Incubating APIs which are subject to change.
+ */
+
+ pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "element-call"
+include("lib")