Linear road benchmark

[gaborhermann]

Implement the linear road benchmark in Emma Streaming. As it is fairly complicated use case that includes most of our goals (e.g. joining with static data), it is an important step in fixing the user facing abstractions.

[aalexandrov]

We can coordinate this with the the BDAPRO project.

[ggevay]

Yes, we can certainly compare code complexity, and maybe also performance.