Add ability to use FilamentPHP Clusters feature

[carlosbarretoeng]

Add Cluster registration feature

[rupadana]

Hi @carlosbarretoeng , Thanks for your contribution to the community! ☺️

i have some note for this PR :

• [x] Please add cluster to the api-service.php
• [x] Update readme.md about the api-service.php

Have a great day!