support multi threaded xz encoder, this might be particularly useful in the case of hydra where the overhead of single threaded encoding is more noticeable e.g most of the time spent in "Sending inputs"/"Receiving outputs" is due to compression while the actual upload to the binary cache seems to be negligible.
support multi threaded xz encoder, this might be particularly useful in
the case of hydra where the overhead of single threaded encoding is more
noticeable e.g most of the time spent in "Sending inputs"/"Receiving outputs"
is due to compression while the actual upload to the binary cache seems
to be negligible.

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