[10.x] Uses PHP Native Type Declarations 🐘 (#6010)

* Adds basic typing around method's arguments and return types

* Adds missing `closure` type

* Adds typing on tests

* Fixes `RedirectIfAuthenticated`

* Fixes `Authenticate`

* Improves `RedirectIfAuthenticated` types

* Fixes user factory `unverified` return type

app/Console/Kernel.php

@@ -9,21 +9,16 @@ class Kernel extends ConsoleKernel
 {
     /**
      * Define the application's command schedule.
-     *
-     * @param  \Illuminate\Console\Scheduling\Schedule  $schedule
-     * @return void
      */
-    protected function schedule(Schedule $schedule)
+    protected function schedule(Schedule $schedule): void
     {
         // $schedule->command('inspire')->hourly();
     }
 
     /**
      * Register the commands for the application.
-     *
-     * @return void
      */
-    protected function commands()
+    protected function commands(): void
     {
         $this->load(__DIR__.'/Commands');