Use IBufferDistributedCache for caching HTTP requests #346
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This will greatly reduce the memory usage for caching so that it will be able to stream it better.
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The main thing we need to cache are the HTTP calls downstream. This replaces the previous caching mechanism with an HTTP delegating handler that will cache calls to registered hosts. This uses the new
IBufferDistributedCacheAPI with the recyclable memorystream to greatly reduce allocations of new arrays (and potentially large GC collections) by pooling the buffers and not needing tonewup large arrays manually.