[3.x] Rename facades (#387)

* Remove Facade suffix from facades, fix #386

* Apply fixes from StyleCI

* Fix facade test

src/Facades/Tenancy.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Facades;
+
+use Illuminate\Support\Facades\Facade;
+use Stancl\Tenancy\TenantManager;
+
+class Tenancy extends Facade
+{
+    protected static function getFacadeAccessor()
+    {
+        return TenantManager::class;
+    }
+}