[summary] data refactor

[gogonzo]

part of #937

1. Simplifying cdisc_data and teal_data

Specifying data in teal can be changed to simply specifying a list of datasets and code (automatically parsed)

library(scda)
ADSL <- synthetic_cdisc_data("latest")$adsl
ADTTE <- synthetic_cdisc_data("latest")$adtte
ADRS <- synthetic_cdisc_data("latest")$adrs


data <- teal.data::cdisc_data(
  ADSL = ADSL, ADTTE = ADTTE, ADRS = ADRS,
  code = quote({
    ADSL <- scda::synthetic_cdisc_data("latest")$adsl
    ADTTE <- scda::synthetic_cdisc_data("latest")$adtte
    ADRS <- scda::synthetic_cdisc_data("latest")$adrs
  })
)

In the same time, it is still possible to use legacy cdisc_dataset which is soft deprecated

cdisc_data(
    cdisc_dataset("ADSL", ADSL),
    cdisc_dataset("ADTTE", ADTTE),
    cdisc_dataset("ADRS", ADRS),
    code = '
      ADSL <- scda::synthetic_cdisc_data("latest")$adsl
      ADTTE <- scda::synthetic_cdisc_data("latest")$adtte
      ADRS <- scda::synthetic_cdisc_data("latest")$adrs
    '
  )