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/BlockedUsersScreen/View/BlockedUsersScreen.swift

@@ -54,7 +54,7 @@ struct BlockedUsersScreen: View {
                             name: user.displayName,
                             contentID: user.userID,
                             avatarSize: .user(on: .blockedUsers),
-                            imageProvider: context.imageProvider)
+                            mediaProvider: context.mediaProvider)
             .accessibilityHidden(true)
     }
 }