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/web/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "@element-hq/element-call-embedded",
+  "version": "0.0.0",
+  "files": [
+    "README.md",
+    "LICENSE-AGPL-3.0",
+    "LICENSE-COMMERCIAL",
+    "dist"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/element-hq/element-call.git"
+  }
+}