Missing TLS support for Redis Client

[mihkelparna1]

Description

Right now, Rekors Redis client implementation does not allow enforcing TLS. This is an issue, because a lot of Redis cluster implementations require TLS for the client connection setup and don't allow non-TLS clients. A good example of this is AWS ElastiCache, when MultiAZ is enabled on ElastiCache Redis, it will require TLS based client connections and will close any non-TLS connections.