Add redis topic prefixing #8229
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It is a common pattern in Redis to use ACLs to restrict access to channels on a per-service basis, these are based on channel name matching. Currently it is not possible to use ACLs with the provided RedisPubSub since the topic prefix is passed into the formatter and hashed.
This PR prepends the prefix into the actual channel name allowing ACLs to be used.
Redis keys are binary safe therefore any string is valid.