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generate enum traits as `constexpr` #2227

Job	Run time
validate	22s
docs / Build linux64	1m 14s
test / Windows MSVC / Build win64	23m 52s
test / Linux gcc-12 / Build linux64	6m 59s
test / Linux gcc-11 / Build linux64	4m 49s
test / Run Linux test suite / Test (ubuntu, gcc-11, default plugins, default config)	1m 6s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	1m 4s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 44s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	1m 36s
	42m 46s

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