How to pass username in auth option for redis.

Hi, I was trying to use username in combination with password for redis storage adapter, but I'm not sure how I can use the `auth` to achieve the same.

Redis 6.0 added username as an optional parameter https://redis.io/commands/auth

Is this supported?

Start by reading the Redis storage adapter and its auth option, then compare the supported authentication form with the Redis 6.0 AUTH documentation linked in the issue. Done means the project either supports username-plus-password authentication or clearly documents that it does not.

Written by the indexing model from the issue text.