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/Package.swift

@@ -0,0 +1,18 @@
+// swift-tools-version: 6.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "EmbeddedElementCall",
+    products: [
+        .library(
+            name: "EmbeddedElementCall",
+            targets: ["EmbeddedElementCall"]),
+    ],
+    targets: [
+        .target(
+            name: "EmbeddedElementCall",
+            resources: [.copy("../dist")]),
+    ]
+)