Support rolling window measures without date range

Cube supports [`rolling_window` measures](https://cube.dev/docs/reference/data-model/measures#rolling_window) that enable a lot of non-trivial calculations such as [period-over-period changes](https://cube.dev/docs/guides/recipes/data-modeling/period-over-period). Currently, it requires a query to have a time dimension with a _defined date range_. We would like to lift that requirement and let such measures work even if the date range is not set.

It's currently planned for January 2025.