feat(eu-data-act): json2iob descriptions + states maps from data dictionary

Two new generated files in lib/ are passed to json2iob.parse() as the
descriptions and states options:

- lib/euDataActDescriptions.json (500 entries)
  Maps each dataFieldName leaf (e.g. "soc") to the human-readable text from
  the EU Data Act PDF data dictionary. json2iob uses these as the
  common.name of the corresponding ioBroker state, so the admin UI now
  shows "State of Charging when charging is started" instead of "soc".

- lib/euDataActStates.json (33 enum leafs)
  Maps each enum field's raw values (e.g. CHARGE_STATE_CHARGING_HV_BATTERY)
  to a pretty label ("Charging Hv Battery"). json2iob renders the dropdown
  for the state from this. The common prefix shared by all members of one
  leaf is stripped before pretty-casing, so e.g. WINDOW_HEATING_STATE_OFF
  appears as just "Off".

Both maps are derived from lib/euDataActDictionary.json (already shipped,
parsed upstream from the PDF). The reproducible derivation lives in
tools/buildEuDataActMaps.js. tools/ is dev-only; not included in the npm
package files glob.

Author: TA2k