Basic sentinel high availability with automatic failover is required

### Feature request type

enhancement

### Is your feature request related to a problem? Please describe

Apart from clustering and data sharding replication, basic Sentinel replication with failover is needed immediately. Sentinel is easy to configure and maintain, and it also supports multiple databases.

### Describe the solution you'd like

Apart from clustering and data sharding replication, basic Sentinel replication with failover is needed immediately. Sentinel is easy to configure and maintain, and it also supports multiple databases. Like redis please provide sentinel feature.

### Describe alternatives you've considered

### Additional context

_No response_

Start by reviewing Garnet's existing clustering, data-sharding replication, and replication features, then compare the requested behavior with Redis Sentinel. Done means Garnet provides basic Sentinel-style replication with automatic failover and supports multiple databases.

Written by the indexing model from the issue text.