カスタム絵文字のかな変換の調整

[4ster1sk]

[A-Za-z0-9_+-]+の場合、一度アンダーバーなどで一旦区切ってからかな変換を行うように変更しました。
下記サンプル

名前	適用前	適用後
blobcat_sentou_with_murakamisan_tutinoko	bぉbかつぇんとううぃthむらかみさんつちのこ	bぉbかtせんとううぃthむらかみさんつちのこ
kaiten_yaki	かいてにゃき	かいてんやき
ouen_arigatou_gozaimasu	おうえなりがとうございます	おうえんありがとうございます

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.

Project coverage is 27.59%. Comparing base (00590c9) to head (0395834).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
lib/repository/emoji_repository.dart	0.00%	17 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #691      +/-   ##
===========================================
- Coverage    27.59%   27.59%   -0.01%     
===========================================
  Files          312      312              
  Lines        16454    16457       +3     
===========================================
  Hits          4541     4541              
- Misses       11913    11916       +3     

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