Query Processing Parallelization After Reading Data Sources in ClickHouse

Query processing is parallelized right after reading FROM file(...). Related to #38755. #48525 (Igor Nikonov). Query processing is parallelized right after reading from any data source. Affected data sources are mostly simple or external storages like table functions url, file. #48727 (Igor Nikonov). This is controlled by the setting parallelize_output_from_storages which is not enabled by default.