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feat(currency): 3-decimal mils + bank cheque format (#112)

Two upstream feature requests, shipped together because they share the
same per-currency precision plumbing:

#256 — 3-decimal currencies (savoirfairelinux/num2words#256)
  Currencies with 1000-mil subunits (BHD, KWD, OMR, JOD, TND, LYD, IQD)
  now round-trip cleanly through to_currency. Driven by:
    - parse_currency_parts gains a `divisor` parameter (defaults 100)
    - Num2Word_Base.CURRENCY_PRECISION class map; per-currency override
    - to_currency reads the divisor and quantizes accordingly
    - Zero-decimal currencies (JPY/KRW are kept at default 100 to
      preserve historical sen/jeon test fixtures; the divisor=1 path
      exists for callers who want round-to-whole-unit explicitly)

  Examples:
    num2words(5.123, currency='BHD')  # 'five dinars, one hundred and twenty-three fils'
    num2words(0.001, currency='TND')  # 'zero dinars, one millime'

#364 — bank cheque format (savoirfairelinux/num2words#364)
  New `to='cheque'` mode emits the standard banking style:
    "ONE THOUSAND, TWO HUNDRED AND THIRTY-FOUR AND 56/100 DOLLARS"
  Combines:
    - integer part as cardinal words
    - " AND " connector
    - fractional subunit as digits/divisor (e.g. 56/100, 234/1000)
    - currency name in plural (cheque convention always pluralises)
    - whole result upper-cased

  Composes cleanly with #256: a BHD cheque ends "234/1000 DINARS".

Tests live in tests/test_currency_3decimal_and_cheque.py covering all
seven mil currencies, integer / float / negative inputs, plural-form
edge cases, and the unknown-currency raise.

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

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