Workflow Purger for Redis

**Is your feature request related to a problem? Please describe.**
Hi, I see that there is an IWorkflowPurger created for SQL Server, Postgres and MongoDB. Do we have the same for Redis?

**Describe the solution you'd like**
I would like to have the ability to purge completed workflows from Redis.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Add any other context or screenshots about the feature request here.

Start by locating the existing IWorkflowPurger implementations for SQL Server, Postgres, and MongoDB, then inspect the Redis persistence implementation. Done means completed workflows can be purged from Redis through the equivalent purger capability.

Written by the indexing model from the issue text.