Use redis as replacement for core's database driven key value store

Updated patch from #11 by @mounir_abid

Corrected paths to files and name.

I didn't test deep. But webprofiler shows that queries to key value table disappear.

tar_inet → changed the visibility of the branch 2840038-use-redis-as to hidden.

tar_inet → changed the visibility of the branch 2840038-use-redis-as to active.

I created a new issue ✨ Use redis as replacement for core's database driven key value store AND key/value expirable store Active to unify changes this task and ✨ Backend for key/value expirable store Needs work