Add PrestoSparkHttpWorkerClient support and RemoteHttpResultFetcher

[tanjialiang]

Add component for the use case of Batch Velox. The added components include:

• Prestissimo worker http client wrapper as a single worker communication endpoint.
• Prestissimo worker task result fetcher.

Tests

• TestPrestoSparkHttpWorkerClient - Added mock classes to test result endpoints

== NO RELEASE NOTE ==