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[bot]]

Coverage report

St.:grey_question:	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 🐣

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St.^{:grey_question:}

| 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 🔻

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St.^{:grey_question:}

| File | Statements | Branches | Functions | Lines | | :----------------------------------------------------------------------------------------------------------------------------------------------------: | :------------------------------------------------------------------------ | :------------------------------------------------------------- | :------------------------------------------------------------ | :------------------------------------------------------------- | :------------------------------------------------------------- | | 🟡 |

`...` / User.ts

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77.97% (-0.98% 🔻)

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88.89% (-11.11% 🔻)

| 45.45% |

77.97% (-0.98% 🔻)

| | 🟢 |

`...` / constant.ts

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83.33% (-4.17% 🔻)

| 100% | 100% | 100% | | 🟢 |

`...` / Group.ts

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84.44% (-3.36% 🔻)

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92.86% (-7.14% 🔻)

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67.74% (+2.22% 🔼)

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84.44% (-3.36% 🔻)

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Test suite run success

101 tests passing in 23 suites.

Report generated by 🧪jest coverage report action from 8113c1a39de34da890f5a67b3cd4e3ffebbb4780