v5.0.0

This release incremented the major version number to v5 for the API breaking changes
related to various conversion functions for Jyutping romanization.
Please see the notes below for details.

Added

• Added yale_to_jyutping to convert Yale romanization into Jyutping.
• characters_to_jyutping, jyutping_to_ipa, jyutping_to_yale,
  yale_to_jyutping, and jyutping_to_tipa now all accept str | list[str]
  as input. A str is treated as a single word with no word segmentation;
  a list[str] carries explicit word segmentation, one word per element.
• Added stringify_yale to take the output of jyutping_to_yale and return
  a string with apostrophes for disambiguating syllable boundaries.
• parse_jyutping now tolerates whitespace between syllables in its input
  string.

Changed

• Breaking: characters_to_jyutping, jyutping_to_ipa,
  jyutping_to_yale, yale_to_jyutping, jyutping_to_tipa, and g2p now
  use a single space to separate the per-syllable representations within
  each word in their output. For example,
  characters_to_jyutping('廣東話') returns [('廣東話', 'gwong2 dung1 waa2')]
  rather than the previous [('廣東話', 'gwong2dung1waa2')]. The underlying
  rime-cantonese data file (chars_to_jyutping.json) is regenerated with
  the same convention so that downstream consumers can recover syllables
  via str.split().
• Breaking: g2p now returns list[tuple[str, str | None]] (the IPA
  element is a single space-separated string), replacing the previous
  list[tuple[str, list[str] | None]] shape.

Removed

• Breaking: removed the return_as keyword argument from
  jyutping_to_ipa, jyutping_to_yale, and yale_to_jyutping.
  These functions now always return a list of strings.
• Breaking: removed the apostrophe-disambiguation behavior that
  jyutping_to_yale previously applied under return_as="string". The
  space between syllables in the new output resolves the same ambiguity.
  Please note:
  • The new stringify_yale takes the output of jyutping_to_yale and returns
    a string with apostrophes for disambiguating syllable boundaries.
  • In yale_to_jyutping input, apostrophes are still accepted but are now
    treated identically to whitespace as a syllable-boundary hint within a
    single word.

Fixed

• Fixed jyutping_to_yale mapping for the kw onset, which was incorrectly
  mapped to k.