add `prepare_isf_2023_scenario()`

[cjyetman]

• work towards https://github.com/RMI-PACTA/workflow.scenario.preparation/issues/9
• precedes https://github.com/RMI-PACTA/workflow.scenario.preparation/pull/24

The iso_2023 object prepared here has some differences with the pacta.scenario.preparation::iso_2023 object, but I have confirmed with @Antoine-Lalechere that they are probably desirable:

• some geography names in the old version have been fixed to what appears to be "standard" in other scenario data objects ("Saudi_Arabia" -> "Saudi Arabia", "South_Africa" -> "South Africa", "South_Korea" -> "South Korea", "USA" -> "US")
• Coal and Oil&Gas values in the old version appear to unintentionally exclude "- Hard coal & lignite" and "- Oil products" values. I believe this is caused by an inner_join with the technology_bridge that does not include those technologies (see here and here)

the following code finds no differences

waldo::compare(
  dplyr::filter(
    dplyr::arrange(pacta.scenario.preparation::isf_2023, scenario, scenario_geography, sector, technology),
    !sector %in% c("Oil&Gas", "Coal")
  ),
  dplyr::filter(
    dplyr::mutate(
      dplyr::arrange(isf_2023, scenario, scenario_geography, sector, technology),
      scenario_geography = dplyr::case_when(
        scenario_geography == "Saudi Arabia" ~ "Saudi_Arabia",
        scenario_geography == "South Africa" ~ "South_Africa",
        scenario_geography == "South Korea" ~ "South_Korea",
        scenario_geography == "US" ~ "USA",
        .default = scenario_geography
      )
    ),
    !sector %in% c("Oil&Gas", "Coal")
  ),
  tolerance = 1e-15
)