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Add support for Gitlab::Redis::Cache in MultiStore

Sylvester Chin requested to merge schin1-multi-store-add-ops into master

What does this MR do and why?

This MR adds support for redis operations performed by Gitlab::Redis::Cache and Rails.cache (which is using redis-cache) into Gitlab::Redis::MultiStore. We need to transit from redis-cache to a distributed/cluster setup and will use MultiStore to perform the transition.

See gitlab-com/gl-infra/scalability#1992 (closed)

This MR will be kept in draft for now. I may want to add the Redis Cluster/Distributed with this in a single MR. The extra functions will help if MultiStore is used for feature-flag migration since operations like expire are missing. Perhaps this MR should be a standalone with the sole purpose of adding more supported operations to MultiStore?

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Edited by Sylvester Chin

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