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/ios/Sources/EmbeddedElementCall/EmbeddedElementCall.swift

@@ -0,0 +1,5 @@
+import Foundation
+
+public let appURL = Bundle.module.url(forResource: "index", withExtension: "html", subdirectory: "dist")
+
+public let bundle = Bundle.module