Change LF stat "empirical accuracy" to "precision"

[astarostap]

I was using Metal's LF analysis function, which gives you the "empirical accuracy" of your LFs. It was pretty confusing, I wasn't sure if it was computing its accuracy or its precision. After some experimentation I realized it's computing rule precisions. So, I thought maybe it would be better to call it "precision" to avoid confusions.

[ajratner]

@astarostap thanks for pointing this out! We need to make sure our naming is clear here. As you pointed out, in all but the simplest label model configurations, 'accuracy' is a misnomer. More precisely, the weights are the estimated conditional probabilities. I think this is clear in the label model now but not necessarily all helper functions throughout the repo... we'll do a cleaning pass here!

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