feat: チャンネル情報参照コマンドの追加

[m1sk9]

close #399

Type of Change:

新機能の追加 ( Command )

Details of implementation (実施内容)

!channel (chinfo, channelinfo) で指定したIDのチャンネルの情報を表示します。

[codecov-commenter]

Codecov Report

Merging #723 (a44393a) into main (4cc82be) will increase coverage by 0.33%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main     #723      +/-   ##
==========================================
+ Coverage   72.53%   72.87%   +0.33%     
==========================================
  Files          69       70       +1     
  Lines        4726     4814      +88     
  Branches      447      455       +8     
==========================================
+ Hits         3428     3508      +80     
  Misses        854      854              
- Partials      444      452       +8     

Flag	Coverage Δ
unittests	72.87% <90.90%> (+0.33%)	⬆️

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Impacted Files	Coverage Δ
src/service/command/channel-info.ts	90.90% <90.90%> (ø)

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