Add console command to disable SAML logins

If a Snipe-IT sire has SAML enabled, and the SAML config is sufficiently
borked, the site will fail to even load the login page. That's probably
something that should be examined, but in the meantime, it'd be handy to
not have to manually edit the database to turn off SAML.

In this commit, I'm creating a saml-disable console command. And by
create, i mean i'm copypasta-ing the existing ldap-disable command.

app/Console/Commands/DisableSAML.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Models\Setting;
+use Illuminate\Console\Command;
+
+class DisableSAML extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'snipeit:saml-disable';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'This is a rescue command that can be used to turn off SAML settings in the event that you managed to lock yourself out using bad SAML settings.';
+
+    /**
+     * Create a new command instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        parent::__construct();
+    }
+
+    /**
+     * Execute the console command.
+     *
+     * @return mixed
+     */
+    public function handle()
+    {
+        if ($this->confirm("\n****************************************************\nThis will disable SAML support. You will not be able \nto login with an account that does not exist \nlocally in the Snipe-IT local database. \n****************************************************\n\nDo you wish to continue? [y|N]")) {
+            $setting = Setting::getSettings();
+            $setting->saml_enabled = 0;
+            if ($setting->save()) {
+                $this->info('SAML has been set to disabled.');
+            } else {
+                $this->info('Unable to disable SAML.');
+            }
+        } else {
+            $this->info('Canceled. No actions taken.');
+        }
+    }
+}