Automatically try reloading failed images on network changes (#3170)

* Add the networkMonitor to the NSE and delete the old MockMediaLoader

* Generate a MediaLoaderMock through AutoMockable and use it in the MediaProviderTests

* Implement an ImageProvider mechanism that automatically tries reloading images when connectivity is established again and use it for LoadableImages

* Merge the ImageProvider protocol back into the MediaProvider

* Address PR review comments

* Provide a default sdk client request configuration

* Address tasks not automatically cancelling themselves when views get deallocated

ElementX/Sources/Screens/StartChatScreen/View/StartChatScreen.swift

@@ -90,7 +90,7 @@ struct StartChatScreen: View {
                 ForEach(context.viewState.usersSection.users, id: \.userID) { user in
                     UserProfileListRow(user: user,
                                        membership: nil,
-                                       imageProvider: context.imageProvider,
+                                       mediaProvider: context.mediaProvider,
                                        kind: .button {
                                            context.send(viewAction: .selectUser(user))
                                        })