Seekable format read optimization #3581
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When decompressing a seekable file, if seeking forward within a frame (by issuing multiple ZSTD_seekable_decompress calls with a small gap between them), the frame will be unnecessarily reread from the beginning. This patch makes it continue using the current frame data and simply skip over the unneeded bytes.
This does the following: 1. Compress test data into multiple frames 2. Perform a series of small decompressions and seeks forward, checking that compressed data wasn't reread unnecessarily. 3. Perform some seeks forward and backward to ensure correctness.
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Replaces #3069 by @YoniGilad