Use Redis Authentication mechanism

[ausias-armesto]

Is your feature request related to a problem? Please describe.
The client gateway uses REDIS without authentication mechanism. It would be nice to be able to configure the client gateway to point to REDIS instances which requires a password to connect to.

Provide references to the feature you are implementing that requires this change
I would like to set these environments with a password

REDIS_URI=redis://${REDIS_PASSWORD}@${REDIS_HOST}:${REDIS_PORT}
REDIS_URI_MAINNET=redis://${REDIS_PASSWORD_MAINNET}@${REDIS_HOST_MAINNET}:${REDIS_PORT_MAINNET}

https://github.com/safe-global/safe-client-gateway/blob/main/.env.sample#L70
Describe the solution you'd like
Modify the rust implementation of the RedisConnectionManager to accept connections with password

Describe alternatives you've considered
None, it is not an option in many platforms to deploy apps which requires unauthenticated redis access