[backend] Client notification on chat channel actions

[lim396]

• enter roomとupdate roomをした時にroom参加者がイベントを受け取れるか確認するテストを追加しました。
• enter roomとupdate roleした時にgatewayからclientにイベントを発行するように変更しました。

追加したテスト

[coderabbitai]

Walkthrough

The update enhances the chat functionality by introducing event handling for room entries and role updates. It streamlines user addition to rooms, centralizing the logic to a specific method and ensuring room role updates emit corresponding events. Additionally, the integration tests now cover new scenarios, including client notifications on chat actions, improving the robustness of the chat feature.

Changes

File(s)	Change Summary
backend/src/chat/chat.gateway.ts backend/src/room/room.service.ts	Introduced handling for room entry, role update, mute, and unmute events with corresponding methods. Added imports for specific event classes.
backend/src/chat/chat.service.ts	Removed handleUserOnRoomCreatedEvent method; room entry handling consolidated in handleUserOnRoomEnteredEvent.
backend/src/common/events/room-update-role.event.ts backend/src/common/events/room-mute.event.ts backend/src/common/events/room-unmute.event.ts	New event classes introduced for handling room role updates, mute, and unmute events respectively.
backend/test/chat-gateway.e2e-spec.ts	Enhanced test coverage with import of Role and code for client notification on chat channel actions.
backend/src/room/mute/mute.controller.spec.ts backend/src/room/mute/mute.service.spec.ts backend/src/room/mute/mute.service.ts	Updated to include EventEmitter2 for emitting events when muting and unmuting users. Methods now trigger RoomMuteEvent and RoomUnmuteEvent for mute and unmute actions.

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