Support for pekko

[otrosien]

Hi Valerian,

I'm reaching out to you as apache pekko got its 1.0.0 release. Due to licensing changes we need to migrate away from akka, and would like to know if you have any ambition to either switch to pekko or support pekko in parallel to akka. We can probably support with pull requests if needed.

[otrosien]

For future users who would pop up here, this is the correct successor project (including a release with pekko support) https://github.com/rediscala/rediscala