Auto merge of #14272 - connorimes:fix-energy-profiling-feature, r=Manishearth

Fix energy profiling feature

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The `energy-profiling` feature was broken at some point when `#![deny(unsafe_code)]` was introduced to the `profile_traits` component.  This PR sets `#[allow(unsafe_code)]` on the `energy` module.
There is an additional commit (my original intention) to update the profiler logging to use the current `ProfilerCategory` enum values for (typically developer-only) performance/power analysis.

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