Support for non-sql event stores.

[cduhard]

Support for https://geteventstore.com/.

[Stephanvs]

Yeah I agree, support for event store would be awesome..

[nvivo]

This has been in the plan since the start, but is not on my queue yet. If anyone wants to try creating a provider, I'd accept a PR.

I'm not sure how to create projections manually in eventstore, but I would guess you can somehow create those streams manually by persisting links instead of events. Any ideas?