feat: add computational work and computational perf units (#43)
* feat: add computational work and computational perf units
Add support for computational work (FLOP) and computational performance
(FLOP per second) units.
* Rename UnitType
* Change unit casing
* Update CHANGELOG.md
* Rename to FlopCount
* Fix renames
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Co-authored-by: Kasper <kasperkh.kh@gmail.com>
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