Multi file uploads (#4358)

* Allow MediaPickerScreen users to select the media selection mode (single or multiple)

* Fix cancellation

* Add support for multiple media URLs on the MediaUploadPreviewScreen.

* Support processing more URLs on the `MediaUploadingPreprocessor` and sending more on the `MediaUploadPreviewScreen`

* Add feature flag for `multipleAttachmentUploadEnabled`

* Add a label showing the current preview item index in the MediaUploadPreviewScreen

* Add support for dragging and dropping or pasting multiple items at the same time.

* Support sharing more than one file through the share extension.

* Limit the number of items that can be shared in one go to 5.

* Fix unit tests

* Fix incorrect fatal error when dealing with single selection media pickers.

* Document the `multipleAttachmentUploadEnabled` usage in the context of the MediaPicker.

* Use a task group for processing selected media in the photo library picker.

* Use a task group for processing multiple selected media in the MediaUploadingPreprocessor

* Switch the maximum number of items that can be shared to 10.

* Allow multiple items to be pasted at the same time.

ElementX/Sources/Screens/RoomDetailsEditScreen/RoomDetailsEditScreenCoordinator.swift

@@ -16,6 +16,7 @@ struct RoomDetailsEditScreenCoordinatorParameters {
     weak var navigationStackCoordinator: NavigationStackCoordinator?
     let userIndicatorController: UserIndicatorControllerProtocol
     let orientationManager: OrientationManagerProtocol
+    let appSettings: AppSettings
 }
 
 enum RoomDetailsEditScreenCoordinatorAction {
@@ -49,9 +50,9 @@ final class RoomDetailsEditScreenCoordinator: CoordinatorProtocol {
                 case .cancel, .saveFinished:
                     self?.actionsSubject.send(.dismiss)
                 case .displayCameraPicker:
-                    self?.displayMediaPickerWithSource(.camera)
+                    self?.displayMediaPickerWithMode(.init(source: .camera, selectionType: .single))
                 case .displayMediaPicker:
-                    self?.displayMediaPickerWithSource(.photoLibrary)
+                    self?.displayMediaPickerWithMode(.init(source: .photoLibrary, selectionType: .single))
                 }
             }
             .store(in: &cancellables)
@@ -63,17 +64,23 @@ final class RoomDetailsEditScreenCoordinator: CoordinatorProtocol {
     
     // MARK: Private
     
-    private func displayMediaPickerWithSource(_ source: MediaPickerScreenSource) {
+    private func displayMediaPickerWithMode(_ mode: MediaPickerScreenMode) {
         let stackCoordinator = NavigationStackCoordinator()
         
-        let mediaPickerCoordinator = MediaPickerScreenCoordinator(userIndicatorController: parameters.userIndicatorController,
-                                                                  source: source,
+        let mediaPickerCoordinator = MediaPickerScreenCoordinator(mode: mode,
+                                                                  appSettings: parameters.appSettings,
+                                                                  userIndicatorController: parameters.userIndicatorController,
                                                                   orientationManager: parameters.orientationManager) { [weak self] action in
             guard let self else { return }
             switch action {
             case .cancel:
                 parameters.navigationStackCoordinator?.setSheetCoordinator(nil)
-            case .selectMediaAtURL(let url):
+            case .selectedMediaAtURLs(let urls):
+                guard urls.count == 1,
+                      let url = urls.first else {
+                    fatalError("Received an invalid number of URLs")
+                }
+                
                 parameters.navigationStackCoordinator?.setSheetCoordinator(nil)
                 viewModel.didSelectMediaUrl(url: url)
             }