Consider to move Dataset/Datastore interfaces to components-api

For the moment we have following interfaces in components-common:

1. DatasetDefinition
2. DatasetProperties
3. DatasetRuntime
4. DatastoreDefinition
5. DatastoreProperties
6. DatastoreRuntime

Initially we put them to components-common, because they were considered to be used only in tcomp-service. Thus, interfaces were not considered like components API.

Now, we found these concepts are very similar to Components concepts:
Datastore is a Connection
Dataset is a data schema (Metadata). Also it describes a way, how data may be retrieved.
Also, from now all components must implement Datastore/Dataset concepts to be compatible with tcomp-service. So, every component will require to depend on components-common.

I think components-common should contain only common implementation, not API.
So, this issue to discuss whether it has sense to move this interfaces and to do it.