Backend long term tasks

This is a list of long term tasks. We might not work on them actively for now, but new code should respect the tasks and not repeat old behaviour:

• Database interacting functions from the Room class should be moved/migrated to the OCA\Talk\Service\RoomService
• OCA\Talk\Room should be an ordinary OCP\AppFramework\Db\Entity class in the OCA\Talk\Model namespace
• $this->dispatcher->dispatch() is deprecated, so we need to move to dedicated events

Move DB interactions to RoomService

• verifyPassword https://github.com/nextcloud/spreed/pull/7248
• setPermissions https://github.com/nextcloud/spreed/pull/7315
• setSIPEnabled https://github.com/nextcloud/spreed/pull/7337
• setLobby https://github.com/nextcloud/spreed/pull/7349
• setListable https://github.com/nextcloud/spreed/pull/7347
• setReadOnly https://github.com/nextcloud/spreed/pull/7354
• setType https://github.com/nextcloud/spreed/pull/7381
• setAssignedSignalingServer https://github.com/nextcloud/spreed/pull/7391
• resetActiveSince https://github.com/nextcloud/spreed/pull/8080
• setLastMessage https://github.com/nextcloud/spreed/pull/8103
• setActiveSince https://github.com/nextcloud/spreed/pull/8087
• setLastActivity https://github.com/nextcloud/spreed/pull/8103
• setPassword https://github.com/nextcloud/spreed/pull/7473
• setDescription https://github.com/nextcloud/spreed/pull/7413
• setName https://github.com/nextcloud/spreed/pull/8103
• deleteRoom https://github.com/nextcloud/spreed/pull/8080
• getName ❓

Replace Room participant getters with ParticipantService

• getParticipantByActor https://github.com/nextcloud/spreed/pull/8102
• getParticipantByAttendeeId https://github.com/nextcloud/spreed/pull/8102
• getParticipantByPin https://github.com/nextcloud/spreed/pull/8102
• getParticipantBySession https://github.com/nextcloud/spreed/pull/8102
• getParticipant