Refactor authentication system (#2602)

Make auth configuration available via UI, remove FOSUserBundle and SAML-Bundle dependency

src/Configuration/SamlConfiguration.php

@@ -0,0 +1,50 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Configuration;
+
+final class SamlConfiguration
+{
+    private $configuration;
+
+    public function __construct(SystemConfiguration $configuration)
+    {
+        $this->configuration = $configuration;
+    }
+
+    public function isActivated(): bool
+    {
+        return $this->configuration->isSamlActive();
+    }
+
+    public function getTitle(): string
+    {
+        return $this->configuration->getSamlTitle();
+    }
+
+    public function getAttributeMapping(): array
+    {
+        return $this->configuration->getSamlAttributeMapping();
+    }
+
+    public function getRolesAttribute(): ?string
+    {
+        return $this->configuration->getSamlRolesAttribute();
+    }
+
+    public function getRolesMapping(): array
+    {
+        return $this->configuration->getSamlRolesMapping();
+    }
+
+    public function getConnection(): array
+    {
+        return $this->configuration->getSamlConnection();
+    }
+}