rust: mostly avoid streaming zstd decompression
Streaming ZStd decompression seems slightly slower, and
the API we use makes it very inconvenient to re-use the
decompression context.
Instead of using that, use the buffer-backed version,
because we can give a reasonable-ish size estimate.
MIT License
Copyright (c) 2017:
Marc Stevens
Cryptology Group
Centrum Wiskunde & Informatica
P.O. Box 94079, 1090 GB Amsterdam, Netherlands
marc@marc-stevens.nl
Dan Shumow
Microsoft Research
danshu@microsoft.com
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