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/Timeline/View/TimelineItemViews/CallNotificationRoomTimelineView.swift

@@ -29,7 +29,7 @@ struct CallNotificationRoomTimelineView: View {
                                 name: timelineItem.sender.displayName ?? timelineItem.sender.id,
                                 contentID: timelineItem.sender.id,
                                 avatarSize: .user(on: .timeline),
-                                imageProvider: context.imageProvider)
+                                mediaProvider: context.mediaProvider)
                 .accessibilityHidden(true)
             
             VStack(alignment: .leading, spacing: 0) {