feat: sensitive channel (#11438)

* feat(backend): add isSensitive to Channel

* feat(backend): support isSensitive in channel endpoints

* feat(frontend/channel-editor): support isSensitive in create/edit channel page

* feat(frontend/channel): show sensitive indicator for sensitive channels

* docs(changelog): add チャンネルをセンシティブ指定できるようになりました

* chore: license header for each file

* chore: add isSensitive of channel to Note object

packages/backend/src/core/entities/ChannelEntityService.ts

@@ -92,6 +92,7 @@ export class ChannelEntityService {
 			isArchived: channel.isArchived,
 			usersCount: channel.usersCount,
 			notesCount: channel.notesCount,
+			isSensitive: channel.isSensitive,
 
 			...(me ? {
 				isFollowing,