feat (PHP LARAVEL) 8417: initial PHP-laravel codegen integration (#574)

* feat (PHP LARAVEL) 8417: initial PHP-laravel codegen integration

* feat (PHP LARAVEL) 8417: code review adjustments

* feat (PHP LARAVEL) 8417: fix typos; add missing files; adjust readme for those unfamilar with laravel to get started quickly

* feat (PHP LARAVEL) 8417: add sample petstore server

* feat (PHP LARAVEL) 8417: adjust route service provdider and model generation

samples/server/petstore/php-laravel/lib/routes/channels.php

@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * OpenAPI Petstore
+ * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+ *
+ * OpenAPI spec version: 1.0.0
+ * 
+ *
+ * NOTE: This class is auto generated by the swagger code generator program.
+ * https://github.com/swagger-api/swagger-codegen.git
+ * Do not edit the class manually.
+ *
+ * Source files are located at:
+ *
+ * > swagger-codegen/modules/swagger-codegen/src/main/resources/php-laravel/
+ */
+
+
+Broadcast::channel('App.User.{id}', function ($user, $id) {
+    return (int) $user->id === (int) $id;
+});