リスト構文の追加

[marihachi]

What

このPRではfull parserに対してリスト構文のパース処理を追加します。
ひとまず一段のリストのサポートが含まれます。

listノードおよびlistItemノードを追加します。

入力例:

- text1 **bold** :emoji:
- text2

生成されるノードツリー:

• list
  • listItem
    • text "text1 "
    • bold
      • text "bold"
    • text " "
    • emojiCode "emoji"
  • listItem
    • text "text2"

resolve #157

Why

Additional info (optional)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.66%. Comparing base (2648486) to head (66c598c).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #165      +/-   ##
===========================================
+ Coverage    97.59%   97.66%   +0.06%     
===========================================
  Files            7        7              
  Lines         1083     1114      +31     
  Branches       304      312       +8     
===========================================
+ Hits          1057     1088      +31     
  Misses          26       26              

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