Add support for Nats

[stormkiller0]

add nats support! ▼▼▼

advantages of Nats:

• high speed

• convenient cluster creation

  nats repository: https://github.com/nats-io/nats-server

[ProdPreva1l]

I don't believe we have plans to add any other forms of messaging services, if you fancy high speed I can recommend KeyDB by Snapchat as it is a fork of redis that retains the open source license and is 5x faster!

[WiIIiam278]

I'm not actually opposed to adding rabbit or this or whatever, wouldn't be too big a major refactor - provided the db has effectively the same feature set of redis and the overheads are fairly minimal on our side.

But I'm not really that fussed personally as redis does work. PRs welcome I suppose :-)