Release v1.7.1

Add LongIndex/LongRange.

Add UnseekableSubStream.
Add Net.Http.CompressedContent.
Add Stream.ReadToEndAsync().
Add ReadAndSlice() overload for reading n-bytes.
Change CopyToAndSliceDest to an overload of WriteAndSlice()
SubStream can now provide length as -1 to bind to BaseStream.Length
Rename SubStream.EndPosition to EndOffset.
SubStream.Dispose() will now dispose the BaseStream.
ArrayPoolRenter.Resize(int) will now return the Array property.
Add overload of ValueTask.ContinueWith for Func<ValueTask, TResult>