Cube Core roadmap

This is meta-issue to track features that are part of Cube Core roadmap.

**Planned**

- Related to data modeling:
- #10265

- Related to the SQL API:
- #8483

- Related to performance:
- #8490

**Released in preview**

- Related to data modeling:

- #8486
- #8489
- #8989

**Released**

- Related to data modeling:
- #8488
- #8988
- #8487

- Related to the SQL API:
- #8491

- Related to Playground:
- #8484
- #8485

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Also, everyone in the Cube community is encouraged to contribute. Useful resources:
- [Guidelines for contributors](https://github.com/cube-js/cube/blob/master/CONTRIBUTING.md).
- [Issues tagged as `help wanted`](https://github.com/cube-js/cube/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22) that you might get inspired with.
- `#contributing-to-cube` channel in the [community Slack](https://slack.cube.dev).