feat: Provide support for RedisCluster Connections

[kchason]

Description

Add support for TLS-encrypted connections to Redis clusters using the RedisCluster object as an option for the RedisHandler cache provider. This is particularly helpful for environments such as AWS' Elasticache Serverless which uses clustered connections.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[michalsn]

I'm sorry, but I'm afraid I can't accept these changes. If you want to add support for RedisCluster, you should create a separate handler.

There are too many differences.

• With RedisCluster we should have the possibility to define many nodes.
• deleteMatching() method should also scan all the nodes and take into account hash slots when calling del().
• clean() method should iterate over every node.
• getCacheInfo() method should iterate over every node.

As an aside: I see that you have implemented support for only one node, so why not just use the Redis class? ElastiCache for Redis allows you to set up different modes, also without clustering support.

[damian-romanowski]

I’m interested in this. Got a few CI apps on K8s that would probably benefit of using my replicated Redis cluster instead of single nodes.

But I agree with @michalsn about the separate handler and node iteration.