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This CL introduces *experimental* CBORReader::ReadDataItemHeader()
method which allows streaming consuming of a large CBOR-encoded array.

Since this API exposes CBORReader::DataItemHeader, which should conceptually be
encapsulated inside CBORReader, the method should not be used widely, and
should be replaced by event-based CBORReader API.

The method is really only for short-term use from SignedExchangeParser, which
definitely requires streaming parsing, but is currently unclear if it will
continue to use CBOR encoding in long term.

Bug: 803774, 811717
Change-Id: If37c70b034afcdecbe6e7793c95b4e1f60eee9d0
Reviewed-on: https://chromium-review.googlesource.com/920723
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537721}