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fix(en_aero): use strict ICAO digit table + canonical en_Aero_ICAO key (#115)

v1.0.14 shipped en_AERO with the 'common' subset of ICAO respellings
(3→tree, 4→fower, 5→fife, 7→seven, 9→niner) and left 1/2/8 as their
everyday English forms. Per ICAO Annex 10 vol II, the FAA phraseology
docs and SKYbrary, the strict table also respells:

  1 → wun
  2 → too
  8 → ait

Use the strict table so the output matches what pilots/ATC actually
say on voice radio. The previous 'common' forms were a soft subset.

Locale key changes:
- New canonical key 'en_Aero_ICAO' (matches the user's recommendation;
  shape is closer to BCP 47 private-use 'en-x-aero-icao').
- Added aliases 'en_aero_icao' and 'en_x_aero_icao' so the BCP 47
  hyphen form 'en-x-aero-icao' resolves correctly through the
  dispatcher's hyphen-to-underscore normalisation.
- 'en_AERO' kept as a back-compat alias for v1.0.14 callers; same
  converter, no behaviour difference beyond the digit table.

Tests updated to expect the strict ICAO digits and the new canonical
key. The fraction-delegation path is preserved (en_Aero_ICAO still
delegates to plain English for ordinals/fractions/currency/cheque so
'1/3' stays "one third").

Sources cited by the user:
- ICAO Annex 10 vol II
- FAA ATC phraseology, AIM 4-2-9 / faa.gov chap11_section_1
- SKYbrary / EUROCONTROL phonetic alphabet
- RFC 5646 (BCP 47) — private-use subtag form

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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