RocksDB research: configuration, lifecycle, basic integration

In accordance with IEP-74 first implementation of persistent Storage will be based on RocksDB K-V storage.

Thus research is needed on how to integrate it into ignite-3 realm. The following questions should be covered:

1. What additional configuration properties are needed.
2. How to reconcile lifecycle of RocksDB instance with Ignite node lifecycle.
3. How RocksDB abstractions (e.g. partitions) match with Ignite abstractions.

Also scope of tasks to implement basic Storage API over RocksDB should be defined.