Implement HTTP progress event

See https://github.com/facebook/react-native/blob/v0.70.5/Libraries/Network/RCTNetworking.mm#L195 :

  return @[@"didCompleteNetworkResponse",
           @"didReceiveNetworkResponse",
           @"didSendNetworkData",
           @"didReceiveNetworkIncrementalData",
           @"didReceiveNetworkDataProgress",
           @"didReceiveNetworkData"];

Events didReceiveNetworkDataProgress and didReceiveNetworkIncrementalData are not triggered/handled by React Native Windows' HTTP module.

This prevents showing HTTP download progress in UI or acknowledging incremental data download steps.

Steps to reproduce

1. Start the Playground app.

   Set-Location packages\playground
   yarn windows --sln windows\playground.sln
   

2. Load the default bundle Samples\rntester.
3. Open the XMLHttpRequest component.
4. On the File Download section, click on the Download 7MB text file button.

Expected result

Progress and total size are displayed in the corresponding text label:

Actual result

The progress indicator stays at 0.