fix: 絵文字の作成者を取得するように修正

[MikuroXina]

Closes #689.

Type of Change:

コードの修正

Cause of the Problem (問題の原因)

Discord.js の API を再確認したところ emoji.fetchAuthor() が存在しており, プログラムの目的としてもこちらを使うのが正しいようでした.

Details of implementation (実施内容)

アダプタの実装は fetchAuthor() を利用するように修正し, あわせて interface EmojiData の emojiAuthorId の型を Snowflake にしておきました.

[codecov-commenter]

Codecov Report

Merging #699 (71c482f) into main (01bde80) will decrease coverage by 0.14%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #699      +/-   ##
==========================================
- Coverage   72.56%   72.43%   -0.14%     
==========================================
  Files          67       67              
  Lines        4691     4694       +3     
  Branches      443      443              
==========================================
- Hits         3404     3400       -4     
- Misses        847      854       +7     
  Partials      440      440              

Flag	Coverage Δ
unittests	72.43% <33.33%> (-0.14%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/adaptor/proxy/emoji.ts	57.14% <14.28%> (-0.76%)	⬇️
src/service/emoji-log.ts	56.66% <100.00%> (-19.20%)	⬇️

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