* Extract composer toolbar to a dedicated component
* Use publisher for composer mode
* Introduce `RoomScreenComposerProvider`
* Add `ComposerToolbarViewModelTests`
* Rename protocols and add passthrough subjects for focused and composer mode
* Remove `ComposerToolbarViewActionHandler` and `ComposerToolbarCoordinatorParameters`
* Remove `RoomScreenComposerActionHandlerProtocol` and `RoomScreenComposerProviderProtocol`
* Re-arrange code a bit
* Remove composer mode being stored on `RoomScreen`
* Rename `process(viewAction: ComposerToolbarViewAction)` to `process(composerAction: ComposerToolbarViewAction)`
* Replace PassthroughSubject with direct function call
* Remove `ComposerToolbarCoordinator`
* Remove `cancelEdit` and `cancelReply` from external composer view model actions
* Use `RoomScreenComposerAction` as a sub-`RoomScreenViewModelAction`
* Move `ComposerToolbarViewModel` callback to actionsSubject
* Move `RoomScreenViewModel` callback to actionsSubject
* Fix `RoomScreenViewModelTests`
* Rename `composerAction` parameter to `roomAction`
* Fix unit tests
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