Higher level api for typical usage

[patriknw]

We have many channels that the user must create and then we use them to glue together the different components. That might give us high flexibility of combining different components with each other. At some point I think we should review that with the DX hat on and see what we can make easier for the normal cases.

Originally posted by @patriknw in #36 (comment)

In that PR we combine akka_projection_rs_grpc::producer with akka_projection_rs_storage. Maybe that could be combined into a higher level user api, which could create the channels.

[huntc]

Higher level abstractions may be possible. One thing I’ve avoided is spawning within the library, as this then ties you to an executor implementation.

[huntc]

https://github.com/lightbend/akka-projection-temp/pull/21 reduces channel creation significantly. How's it looking w.r.t. to this issue given that PR?

[patriknw]

Great improvements, I think this issue can be closed and we add more specific issues if we have any further suggestions.

[huntc]

Fixed by #126