Feature Request: Implement derive_param_extreme_record()

[bundfussr]

Feature Idea

Implement a function selecting the first or last record from multiple sources and adding the selected record as a new records to the input dataset.

Relevant Input

No response

Relevant Output

No response

Reproducible Example/Pseudo Code

derive_param_extreme_record(
  adevent,
  sources = list(
    records(
      dataset_name = "cm",
      filter = CMDECOD == "ANTI-CANCER THERAPY",
      new_vars = exprs(
        ADT = convert_dtc_to_dt(CMSTDTC),
        AVALC = CMDECOD),
    ),
    records(
      dataset_name = "pr",
      filter = PRDECOD == "ANTI-CANCER SURGERY",
      new_vars = exprs(
        ADT = convert_dtc_to_dt(PRSTDTC),
        AVALC = PRDECOD),
    ),
  source_datasets = list(cm = cm, pr = pr),
  order = exprs(ADT),
  mode = "first",
  set_values_to = exprs(
    PARAMCD = "FIRSTACT",
    PARAM = "First anti-cancer therapy"
  )
)