Implement and verify the naive translation of lazy/force to thunks #98
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This is based on the latest metacoq, whose -unsafe-erasure includes a translation from cofixpoints to fix + lazy/force (yet unverified, as this requires a fair bit of knowledge about the productivity condition). So CertiCoq now supports cofixpoints when used with that pipeline. We do the lazy/force translation to lambdas/applications in the first translation phase and verify that it correctly simulates the reduction rules of lazy/force. We add a lazy factorial test in the benchmarks.