Use direct nanosecond operations in quanta, bring speed back to baseline #190
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This uses metrics-rs/quanta#86 to avoid roundtripping nanosecond counts through Duration, which does a bunch of integer math on construction and deconstruction, which we don't even need (unless we exceed the 270 years of governor's useful operational uptime).
In benchmarks, this brings speeds back to the baseline pre-quanta-0.11 (see #175)