Simplifies selector_list into aggregated list with one element per
same selector - same dataset, same filter configuration and same reshape status.
get_dplyr_call_data(selector_list, join_keys = teal.data::join_keys())(reactive)
output from data_extract_multiple_srv() or a reactive named list of
outputs from data_extract_srv().
When using a reactive named list, the names must be identical to the shiny
ids of the respective
data_extract_ui().
(join_keys) nested list of keys used for joining.
(list) simplified selectors with aggregated set of filters,
selections, reshapes etc. All necessary data for merging.