Running Cube with pre-aggregations disabled

[igorlukanin]

Is your feature request related to a problem? Please describe.
I have a complex Cube project with an external pre-aggregation database and pre-aggregations set up. However, I also wanted to run it locally without pre-aggregations, just to test a few schema changes. In order to do so, I needed to remove the pre-aggregations from my schema files.

Describe the solution you'd like
I'd like to be able to run Cube.js with a configuration option that makes Cube.js ignore pre-aggregations and always hit the raw data, e.g.,CUBEJS_PRE_AGGREGATIONS=false.

Describe alternatives you've considered
Using dynamic schema generation to wrap my cubes and remove preAggregations from them based on a custom configuration flag.

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