Add initial files and templates for ps_emailalerts module

- Created LICENSE file for composer dependencies.
- Added autoload files: autoload_classmap.php, autoload_namespaces.php, autoload_psr4.php, autoload_real.php, and autoload_static.php.
- Initialized installed.json for composer.
- Added index.php and form templates for admin configuration.
- Implemented front-end templates for email alerts, including account management and product notifications.
- Included necessary headers and copyright notices in all new files.

modules/ps_cashondelivery/tests/phpstan/phpstan-1.7.8.neon

@@ -0,0 +1,6 @@
+includes:
+	- %currentWorkingDirectory%/tests/phpstan/phpstan.neon
+
+parameters:
+  ignoreErrors:
+    - '#Property OrderStateCore\:\:\$template \(array<string>\) does not accept string.#'