feat: Add method to check if ISO is mounted for a VM

Introduce `isMountedIso` method to verify if an ISO is attached to a virtual machine. This includes input validation for VM ID and retrieves the mounting status from the API response.

Author: efebagri

src/RootServer/RootServer.php

@@ -79,6 +79,17 @@ public function getIsos(): mixed
         return $this->client->get('vm/list/iso');
     }
 
+    /**
+     * @param int $vm_id
+     * @return bool
+     * @throws GuzzleException
+     */
+    public function isMountedIso(int $vm_id): bool
+    {
+        $this->validateVMId($vm_id);
+        return $this->client->get("vm/{$vm_id}/config")['data']['config']['iso']['attached'] ?? false;
+    }
+
     /**
      * @param int $vm_id
      * @param string $iso