Add Champion model, form validation, and components for StreamerPanel.

- Added Champion model to StreamerPanelController.
- Implemented form validation for champion_id, platform, username, and displayname in create and update methods.
- Created StreamerCreateForm and StreamersTable components for better organization.

app/View/Components/Streamerpanel/StreamerCreateForm.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\View\Components\Streamerpanel;
+
+use Closure;
+use Illuminate\Contracts\View\View;
+use Illuminate\View\Component;
+
+class StreamerCreateForm extends Component
+{
+    /**
+     * Create a new component instance.
+     */
+    public function __construct(public $champions)
+    {
+        //
+    }
+
+    /**
+     * Get the view / contents that represent the component.
+     */
+    public function render(): View|Closure|string
+    {
+        return view('components.streamerpanel.streamer-create-form');
+    }
+}