[WIP] Experimental Sketch API for Atomic MultiLog#127

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ujvl wants to merge 3 commits intoucbrise:single-machinefrom

ujvl:multilog-sketch-iface

Commits on Jan 16, 2019

Initial sketch-related API additions to atomic_multilog
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Commits on Jan 17, 2019

Batch Appends updated to support sketches.
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Commits on Jan 22, 2019

Multilog API for evaluating a metric using a sketch
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