Bind compression/decompression context to thread-local data for reuse #8
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This allows to reuse the contexts between nif calls, having a noticeable impact on perf.
See
https://facebook.github.io/zstd/zstd_manual.html#Chapter4
The PR is not very polished (it will never deallocate the context, on nif reload for example). Altough we are using it as we don't need live nif upgrade.
Would you be ok on merging this if it where completed?.