Add Database.Redis.Schema.RemoteJob

[jbransen]

This adds the implementation and documentation of the Database.Redis.Schema.RemoteJob module, which allows distributed job scheduling. I believe it might be useful outside of Chordify, and judging from the readme it has always been the intention to open-source it.

For those that work at Chordify: there are some small differences to the internal implementation, because Data.OneOf is not public. For runRemoteJob I added the FindHandler class to find the index in the type-level list, and I have decided to exclude inspectQueue and inspectRunningJobs for now because I did not see an easy way of implementing that without Data.OneOf.

[matus-chordify]

Thank you! I've just got some cosmetic remarks. Some of them (like naming things) may not actually even be your "fault" but I've included them, anyway.

I haven't read the algorithm too closely, as I know it's been tested quite a bit.