Add redis sentinel backend #1
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This new backend allows using a Redis Sentinel cluster to reliably store objects in the cache. With the redundancy and automatic master switching in a Redis Sentinel cluster, it ensures that the service and data stays available even if some of the storage nodes go down. Please note that due to the delay in Redis replication, some of the most recent data inserted in the current master can be lost if this host goes down before having a chance to replicate the change. It also takes some time for Sentinel to detect a host going down and elect a new master, so a short outage may occur when the current master fails. Redis Sentinel documentation (https://redis.io/docs/latest/operate/oss_and_stack/management/sentinel/) recommends a minimum of 3 nodes and gives several architecture examples.
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