Add Japanese kana characters to default exceptions (fix #9693) (#9742)

This includes the main kana, or phonetic characters, used in Japanese.

There are some supplemental kana blocks in Unicode outside the BMP that
could also be included, but because their actual use is rare I omitted
them for now, but maybe they should be added. The omitted blocks are:

- Kana Supplement
- Kana Extended (A and B)
- Small Kana Extension

spacy/lang/char_classes.py

@@ -45,6 +45,10 @@ _hangul_syllables = r"\uAC00-\uD7AF"
 _hangul_jamo = r"\u1100-\u11FF"
 _hangul = _hangul_syllables + _hangul_jamo
 
+_hiragana = r"\u3040-\u309F"
+_katakana = r"\u30A0-\u30FFー"
+_kana = _hiragana + _katakana
+
 # letters with diacritics - Catalan, Czech, Latin, Latvian, Lithuanian, Polish, Slovak, Turkish, Welsh
 _latin_u_extendedA = (
     r"\u0100\u0102\u0104\u0106\u0108\u010A\u010C\u010E\u0110\u0112\u0114\u0116\u0118\u011A\u011C"
@@ -244,6 +248,7 @@ _uncased = (
     + _tamil
     + _telugu
     + _hangul
+    + _kana
     + _cjk
 )