feat(server): add redis sentinel support

[kontrollanten]

Description

Adds redis sentinel support.

Related issues

closes #5141

Has this been tested?

Yes, manually. By setting up the following sentinel and connecting:

version: '2'

services:
  redis-sentinel:
    image: docker.io/bitnami/redis-sentinel:7.0
    environment:
      - REDIS_MASTER_HOST=127.0.0.1
    networks:
      - webproxy
    ports:
      - 26379:26379
    volumes:
      - redis-sentinel_data:/bitnami
  redis:
    image: docker.io/bitnami/redis:7.0
    environment:
      # ALLOW_EMPTY_PASSWORD is recommended only for development.
      - ALLOW_EMPTY_PASSWORD=yes
    networks:
      - webproxy
    ports:
      - 6379:6379
    volumes:
      - redis_data:/bitnami
volumes:
  redis-sentinel_data:
    driver: local
  redis_data:
    driver: local

networks:
  webproxy:
    driver: bridge

Not sure if it's worth to setup a test for this feature?

[Chocobozzz]

Thanks!