feat: 引数なしでVC参加するタイプのコマンドにstartサブコマンドを追加

[MikuroXina]

Resolves #1040.

Type of Change:

機能の新規追加, テストの追加

Details of implementation (実施内容)

引数なしでボイスチャンネルに参加する方式だったコマンド群に対して, start サブコマンドでも参加するように機能を追加しました. またその場合でもこれまでと同じ動作になることを確かめるテストを追加しました.

[codecov]

Codecov Report

Merging #1111 (4a92f72) into main (bb03b54) will increase coverage by 0.13%.
The diff coverage is 60.46%.

@@            Coverage Diff             @@
##             main    #1111      +/-   ##
==========================================
+ Coverage   72.43%   72.57%   +0.13%     
==========================================
  Files          80       80              
  Lines        5464     5484      +20     
  Branches      486      487       +1     
==========================================
+ Hits         3958     3980      +22     
+ Misses       1021     1018       -3     
- Partials      485      486       +1     

Flag	Coverage Δ
unittests	72.57% <60.46%> (+0.13%)	⬆️

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Files	Coverage Δ
packages/bot/src/service/command/party.ts	83.13% <87.50%> (+0.34%)	⬆️
packages/bot/src/service/command/kaere.ts	73.06% <54.28%> (+1.67%)	⬆️

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