Implements #745, #746, #747 - Initial media uploading flows

- room composer contextual menu for selecting source
- coordinator for presenting the different sources
- system picker handling and URL passback
- file preview after selection
- feature flag

ElementX/Sources/Screens/Other/ActivityCoordinator.swift

@@ -1,31 +0,0 @@
-//
-// Copyright 2022 New Vector Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-import SwiftUI
-
-class ActivityCoordinator: CoordinatorProtocol {
-    let items: [Any]
-    
-    init(items: [Any]) {
-        self.items = items
-    }
-    
-    func toPresentable() -> AnyView {
-        AnyView(UIActivityViewControllerWrapper(activityItems: items)
-            .presentationDetents([.medium])
-            .ignoresSafeArea())
-    }
-}