Enhance Cluster Service for secure and restricted communication during document detach on Client Deactivation

[raararaara]

What would you like to be added:
In PR #1036, logic for document detachment during Client Deactivation was introduced. As Yorkie's documents are distributed across servers based on shard keys, a Cluster Server was needed for inter-cluster communication during deactivation. However, there are still critical issues that need addressing:

1. Authentication: Since the client may require a token for authentication, we need a structure for authentication during server-to-server communication. It’s important to ensure that communication between servers is secure.

2. External Call Restrictions: The logic within ClusterService should only be used for inter-server communication. We need to establish methods to restrict external calls or entirely prevent exposure to enhance security.

Why is this needed:
These enhancements will provide a secure and controlled environment for document operations during client deactivation, significantly reducing potential security risks associated with unauthenticated access and improper external calls.