Cleaning redis service and adding ttl getter method (#11)

Use strict types instead of var

Merge branch 'master' into kris/refactor_redis_service

Add method for getting TTL for redis entity

Refactor and fix RedisService

Co-authored-by: Kristijan Mitrovic <kmitrovic@itekako.com>
Co-authored-by: jonathan <jonathan@noreply.git.bubblev.org>
Reviewed-on: https://git.bubblev.org/bubblev/cobbzilla-wizard/pulls/11