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/RoomMemberListScreen/RoomMembersListScreenViewModel.swift

@@ -43,7 +43,7 @@ class RoomMembersListScreenViewModel: RoomMembersListScreenViewModelType, RoomMe
         
         super.init(initialViewState: .init(joinedMembersCount: roomProxy.joinedMembersCount,
                                            bindings: .init(mode: initialMode)),
-                   imageProvider: mediaProvider)
+                   mediaProvider: mediaProvider)
         
         setupMembers()
     }