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/.gitattributes

@@ -0,0 +1,8 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf