feat(authorization): add roles and permissions models, migration, and tests

app/Domains/Authorization/Models/Role.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Domains\Authorization\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+
+class Role extends Model
+{
+    protected $table = 'roles';
+
+    protected $fillable = [
+        'codigo',
+        'nombre',
+        'descripcion',
+    ];
+
+    /**
+     * @return BelongsToMany<Permission, $this>
+     */
+    public function permissions(): BelongsToMany
+    {
+        return $this->belongsToMany(
+            Permission::class,
+            'roles_permisos',
+            'rol_codigo',
+            'codigo_permiso',
+            'codigo',
+            'codigo'
+        )->withTimestamps();
+    }
+}