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/ReadReceipts/ReadReceiptsSummaryView.swift

@@ -31,7 +31,7 @@ struct ReadReceiptsSummaryView: View {
                     ForEach(orderedReadReceipts) { receipt in
                         ReadReceiptCell(readReceipt: receipt,
                                         memberState: context.viewState.members[receipt.userID],
-                                        imageProvider: context.imageProvider)
+                                        mediaProvider: context.mediaProvider)
                     }
                 }
             }