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feature: topology module

Yaroslav Dynnikov requested to merge topology-module into master

It encapsulates the logics of a JoinRequest batch processing.

Topology module will be quite important in picodata. This first version misses a lot of features, but a few commits later it's going to implement quite a lot of logics.

When a new instance is joined - there's one complex thing: raft leader has to decide where this new instance is going to be emplaced, i.e. what replicaset should it join. There're many different parameters have an influence - repliction_factor, failure-domain, and of course the existing topology. So, this new topology module must make the decision.

This patch only refactors the current Picodata behavior, and doesn't bring new features for its users. Instead, it opens the door to a future development.

Also, this patch provides a unit-testing basis for the future features.

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