Update Datastore indexes

[yuri-sergiichuk]

The current indexes config in the repository is outdated and does not work anymore with the Spine 2.x version of the library.

At least the following index should be added:

  - kind: spine.server.aggregate.AggregateEventRecord
    properties:
      - name: aggregate_id
      - name: version
        direction: desc
      - name: created
        direction: desc

We should also check if the currently defined indexes are still relevant.