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/Other/Extensions/ClientBuilder.swift

@@ -29,6 +29,7 @@ extension ClientBuilder {
             .slidingSyncProxy(slidingSyncProxy: slidingSyncProxy?.absoluteString)
             .enableCrossProcessRefreshLock(processId: InfoPlistReader.main.bundleIdentifier, sessionDelegate: sessionDelegate)
             .userAgent(userAgent: UserAgentBuilder.makeASCIIUserAgent())
+            .requestConfig(config: .init(retryLimit: 0, timeout: 15000, maxConcurrentRequests: nil, retryTimeout: nil))
         
         builder = switch slidingSync {
         case .restored: builder