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/publish_android_package.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+
+EC_ASSETS_FOLDER=lib/src/main/assets/element-call
+CURRENT_DIR=$( dirname -- "${BASH_SOURCE[0]}" )
+
+pushd $CURRENT_DIR > /dev/null
+
+function build_assets() {
+	echo "Generating Element Call assets..."
+	pushd ../..  > /dev/null
+	yarn build
+	popd  > /dev/null
+}
+
+function copy_assets() {
+	if [ ! -d $EC_ASSETS_FOLDER ]; then
+		echo "Creating $EC_ASSETS_FOLDER..."
+		mkdir -p $EC_ASSETS_FOLDER
+	fi
+
+	echo "Copying generated Element Call assets to the Android project..."
+	cp -R ../../dist/* $EC_ASSETS_FOLDER
+}
+
+getopts :sh opt
+case $opt in 
+	s)
+		SKIP=1
+		;;
+	h)
+		echo "-s: will skip building the assets and just publish the library."
+		exit 0
+		;;
+esac
+
+if [ ! $SKIP ]; then
+  read -p "Do you want to re-build the assets (y/n, defaults to no)? " -n 1 -r
+  echo ""
+  if [[ $REPLY =~ ^[Yy]$ ]]; then
+    build_assets
+  else 
+    echo "Using existing assets from ../../dist"
+  fi
+  copy_assets
+elif [ ! -d $EC_ASSETS_FOLDER ]; then
+  echo "Assets folder at $EC_ASSETS_FOLDER not found. Either build and copy the assets manually or remove the -s flag."
+  exit 1
+fi
+
+# Exit with an error if the gradle publishing fails
+set -e
+echo "Publishing the Android project"
+
+./gradlew publishAndReleaseToMavenCentral --no-daemon
+
+popd  > /dev/null