Add bulk update gateway endpoint to vCenter API routes

- Introduced a new POST route 'bulk-update-gateway' for bulk updating gateways.
- This route is protected by the 'module-vcenter.manager' permission middleware.

app/Models/IpPoolContact.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class IpPoolContact extends Model
+{
+    protected $fillable = ['ip_pool_id', 'email', 'type'];
+
+    public function ipPool()
+    {
+        return $this->belongsTo(IpPool::class);
+    }
+}