Enhancement: Dynamic selectors for NCA settings

[Gero1999]

Description

Right now the tab NCA > NCA settings contains three static filters that allow the user to choose the analyte, dose number and specimen that they want to run the NCA. These selectors filter the intervals specified in mydata$intervals ro run the NCA.

Instead of these static inputs, I would like the number of filters and the columns are filtered are more based on the data. On specific, the perfect solution would only consider filters for those concentration group columns in data() that have at least more than 1 unique value. These columns in specific referred to those mapped for:

STUDYID, USUBJID, Additional grouping variables, ANALYTE, PCSPEC, DRUG and additionally if present DOSNO.

Definition of Done

The requirements for the feature to be complete:

• Dynamic number of inputs for relevant interval columns
• Action buttons to choose all or drop all but 1
• Selected by default 1 (first) available choice in data

Blocked until #174 is closed