feat: adds support for sentinel

[sfranke]

🚀 Fix #155 - feature request: support for redis sentinel

This PR adds necessary changes for a sentinel configuration. This allows the users to connect via a redis sentinel rather than a single redis instance.

📦 What's in the box?

• [x] Your feature
• [ ] Your improvement
• [ ] Your fix

🤖 How to test it?

• Checkout the fix/branch-name
• Setup a redis sentinel and at least one redis instance
• Setup the new environment variables and connect via sentinel

⚠️ WARNING!

• I extended the configuration without changing the existing approach even though the concept of host and port for the sentinel changes a bit because by nature you will want to configure multiple hosts with possibly multiple different ports. Please let me know what you think.

🎉 Links useful

• sentinel setup

I used the bitnami containers for testing:

docker run -d --name redis-server \
    -e ALLOW_EMPTY_PASSWORD=yes \
    -p 6379:6379 \
    bitnami/redis:latest

docker run -it --rm \
    -e REDIS_MASTER_HOST=localhost \
    -p 26379:26379 \
    bitnami/redis-sentinel:latest

[Venatum]

Hello, Thanks for this PR, I'll do my best to make it available as soon as possible. I'm going to merge it into another PR so that I can add tests.