feat: 그룹 변경 커맨드 핸들러 구현

[Coalery]

주요 변경 사항

그룹 변경 커맨드 핸들러를 구현합니다.
그리고 관련 이벤트와 그 핸들러를 구현합니다.

변경 이유

기존 기능의 호환을 위함입니다.

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	72.88% (-2.86% 🔻)	715/981
🔴	Branches	50% (-7.52% 🔻)	104/208
🔴	Functions	50.38% (+0.18% 🔼)	133/264
🟡	Lines	72.72% (-2.8% 🔻)	669/920

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / GroupStateChanged.ts	100%	100%	100%	100%
🟢	... / ChangeGroupStateCommand.ts	100%	100%	100%	100%
🟢	... / ChangeGroupStateCommandHandler.ts	91.89%	69.57%	100%	91.67%
🟢	... / ChangeGroupStateCommandResult.ts	100%	100%	100%	100%
🔴	... / GroupStateChangedHandler.ts	0%	0%	0%	0%

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟡	... / User.ts	77.97% (-0.98% 🔻)	88.89% (-11.11% 🔻)	45.45%	77.97% (-0.98% 🔻)
🟢	... / constant.ts	83.33% (-4.17% 🔻)	100%	100%	100%
🟢	... / Group.ts	84.44% (-3.36% 🔻)	92.86% (-7.14% 🔻)	67.74% (+2.22% 🔼)	84.44% (-3.36% 🔻)

Test suite run success

101 tests passing in 23 suites.

Report generated by 🧪jest coverage report action from 8113c1a