feat: Add functionality to retrieve champion images from the database

- Added a new function `getChampionImage` to fetch champion images based on ID and type.
- Created a new model `ChampionImage` to store champion image details in the database.
- Implemented seeding of champion images using `ChampionImageSeeder`.
- Updated usage of champion images in existing methods.

app/Models/ChampionImage.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class ChampionImage extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'full_id',
+        'champion_id',
+        'type',
+        'url',
+    ];
+
+    public function champion()
+    {
+        return $this->belongsTo(Champion::class);
+    }
+}