propagate only timeDimensions to subQuery

I am trying to work on a scenario in which several dimension should be calculated based sub query of another cube.

When propagating filters to the sub_query, I want to be able to propagate only the timeDimension so I could for example calculate the average or percentile of all values regardless of the other dimension filters.

I think the solution should be easy, add another property to `dimension` called `propagate_time_dimensions_to_sub_query ` that behaves just like `propagate_filters_to_sub_query` just does't pass the segments and the filters value.

The code [here](https://github.com/cube-js/cube/blob/5ce589a1e7b3f8e3f850fdc9abadb26e212f2da4/packages/cubejs-schema-compiler/src/adapter/BaseQuery.js#L1575)

So we can just do:

```js
if (symbol.propagateTimeDimensionsToSubQuery) {
timeDimensions = this.filtersWithoutSubQueries.filter(
f => f instanceof BaseTimeDimension
).map(f => ({
dimension: f.dimension,
dateRange: f.dateRange
}));

```

I think I can do that myself, if you think this feature is valuable to others.